mirror of
https://github.com/ZiuChen/ZiuChen.github.io.git
synced 2025-08-17 23:19:55 +08:00
302 lines
86 KiB
HTML
302 lines
86 KiB
HTML
<!DOCTYPE html>
|
||
<html lang="en-US" dir="ltr">
|
||
<head>
|
||
<meta charset="utf-8">
|
||
<meta name="viewport" content="width=device-width,initial-scale=1">
|
||
<title>一文读懂函数中this指向问题 | ZiuChen</title>
|
||
<meta name="description" content="Unlimited Progress.">
|
||
<link rel="preload stylesheet" href="/assets/style.ec1c8c15.css" as="style">
|
||
|
||
<script type="module" src="/assets/app.499ce9ef.js"></script>
|
||
<link rel="preload" href="/assets/inter-roman-latin.2ed14f66.woff2" as="font" type="font/woff2" crossorigin="">
|
||
<link rel="modulepreload" href="/assets/chunks/framework.9b71bc06.js">
|
||
<link rel="modulepreload" href="/assets/chunks/theme.35023a02.js">
|
||
<link rel="modulepreload" href="/assets/article_一文读懂函数中this指向问题.md.28d5e9b4.lean.js">
|
||
<link rel="icon" href="/logo.png">
|
||
<script id="check-dark-mode">(()=>{const e=localStorage.getItem("vitepress-theme-appearance")||"auto",a=window.matchMedia("(prefers-color-scheme: dark)").matches;(!e||e==="auto"?a:e==="dark")&&document.documentElement.classList.add("dark")})();</script>
|
||
<script id="check-mac-os">document.documentElement.classList.toggle("mac",/Mac|iPhone|iPod|iPad/i.test(navigator.platform));</script>
|
||
</head>
|
||
<body>
|
||
<div id="app"><div class="Layout" data-v-9d158fda><!--[--><!--]--><!--[--><span tabindex="-1" data-v-204cb7b1></span><a href="#VPContent" class="VPSkipLink visually-hidden" data-v-204cb7b1> Skip to content </a><!--]--><!----><header class="VPNav" data-v-9d158fda data-v-8afa7537><div class="VPNavBar has-sidebar" data-v-8afa7537 data-v-56b97c0f><div class="container" data-v-56b97c0f><div class="title" data-v-56b97c0f><div class="VPNavBarTitle has-sidebar" data-v-56b97c0f data-v-5e4abee9><a class="title" href="/" data-v-5e4abee9><!--[--><!--]--><!--[--><img class="VPImage logo" src="/logo.png" alt data-v-c46cb0a1><!--]--><!--[-->ZiuChen<!--]--><!--[--><!--]--></a></div></div><div class="content" data-v-56b97c0f><div class="curtain" data-v-56b97c0f></div><div class="content-body" data-v-56b97c0f><!--[--><!--]--><div class="VPNavBarSearch search" data-v-56b97c0f><!--[--><!----><div id="docsearch"><button type="button" class="DocSearch DocSearch-Button" aria-label="Search"><span class="DocSearch-Button-Container"><svg class="DocSearch-Search-Icon" width="20" height="20" viewBox="0 0 20 20" aria-label="search icon"><path d="M14.386 14.386l4.0877 4.0877-4.0877-4.0877c-2.9418 2.9419-7.7115 2.9419-10.6533 0-2.9419-2.9418-2.9419-7.7115 0-10.6533 2.9418-2.9419 7.7115-2.9419 10.6533 0 2.9419 2.9418 2.9419 7.7115 0 10.6533z" stroke="currentColor" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"></path></svg><span class="DocSearch-Button-Placeholder">Search</span></span><span class="DocSearch-Button-Keys"><kbd class="DocSearch-Button-Key"></kbd><kbd class="DocSearch-Button-Key">K</kbd></span></button></div><!--]--></div><nav aria-labelledby="main-nav-aria-label" class="VPNavBarMenu menu" data-v-56b97c0f data-v-471dd2d2><span id="main-nav-aria-label" class="visually-hidden" data-v-471dd2d2>Main Navigation</span><!--[--><!--[--><a class="VPLink link VPNavBarMenuLink" href="/" tabindex="0" data-v-471dd2d2 data-v-79f36db3><!--[--><span data-v-79f36db3>首页</span><!--]--></a><!--]--><!--[--><div class="VPFlyout VPNavBarMenuGroup" data-v-471dd2d2 data-v-8f17ebbc><button type="button" class="button" aria-haspopup="true" aria-expanded="false" data-v-8f17ebbc><span class="text" data-v-8f17ebbc><!----><span data-v-8f17ebbc>我的项目</span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="text-icon" data-v-8f17ebbc><path d="M12,16c-0.3,0-0.5-0.1-0.7-0.3l-6-6c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l5.3,5.3l5.3-5.3c0.4-0.4,1-0.4,1.4,0s0.4,1,0,1.4l-6,6C12.5,15.9,12.3,16,12,16z"></path></svg></span></button><div class="menu" data-v-8f17ebbc><div class="VPMenu" data-v-8f17ebbc data-v-f5acf789><div class="items" data-v-f5acf789><!--[--><!--[--><div class="VPMenuLink" data-v-f5acf789 data-v-5f1b289c><a class="VPLink link" href="/project/ClipboardManager/" data-v-5f1b289c><!--[-->超级剪贴板<!--]--></a></div><!--]--><!--[--><div class="VPMenuLink" data-v-f5acf789 data-v-5f1b289c><a class="VPLink link" href="/project/Markdown/" data-v-5f1b289c><!--[-->超级Markdown<!--]--></a></div><!--]--><!--[--><div class="VPMenuLink" data-v-f5acf789 data-v-5f1b289c><a class="VPLink link" href="/project/JSRunner/" data-v-5f1b289c><!--[-->超级JavaScript<!--]--></a></div><!--]--><!--[--><div class="VPMenuLink" data-v-f5acf789 data-v-5f1b289c><a class="VPLink link" href="/project/SmartWordBreak/" data-v-5f1b289c><!--[-->超级分词<!--]--></a></div><!--]--><!--]--></div><!--[--><!--]--></div></div></div><!--]--><!--[--><div class="VPFlyout VPNavBarMenuGroup" data-v-471dd2d2 data-v-8f17ebbc><button type="button" class="button" aria-haspopup="true" aria-expanded="false" data-v-8f17ebbc><span class="text" data-v-8f17ebbc><!----><span data-v-8f17ebbc>开源作品</span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="text-icon" data-v-8f17ebbc><path d="M12,16c-0.3,0-0.5-0.1-0.7-0.3l-6-6c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l5.3,5.3l5.3-5.3c0.4-0.4,1-0.4,1.4,0s0.4,1,0,1.4l-6,6C12.5,15.9,12.3,16,12,16z"></path></svg></span></button><div class="menu" data-v-8f17ebbc><div class="VPMenu" data-v-8f17ebbc data-v-f5acf789><div class="items" data-v-f5acf789><!--[--><!--[--><div class="VPMenuLink" data-v-f5acf789 data-v-5f1b289c><a class="VPLink link" href="/works/opensource.html" data-v-5f1b289c><!--[-->个人作品<!--]--></a></div><!--]--><!--[--><div class="VPMenuLink" data-v-f5acf789 data-v-5f1b289c><a class="VPLink link" href="/works/contribution.html" data-v-5f1b289c><!--[-->社区贡献<!--]--></a></div><!--]--><!--]--></div><!--[--><!--]--></div></div></div><!--]--><!--[--><div class="VPFlyout VPNavBarMenuGroup" data-v-471dd2d2 data-v-8f17ebbc><button type="button" class="button" aria-haspopup="true" aria-expanded="false" data-v-8f17ebbc><span class="text" data-v-8f17ebbc><!----><span data-v-8f17ebbc>学习笔记</span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="text-icon" data-v-8f17ebbc><path d="M12,16c-0.3,0-0.5-0.1-0.7-0.3l-6-6c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l5.3,5.3l5.3-5.3c0.4-0.4,1-0.4,1.4,0s0.4,1,0,1.4l-6,6C12.5,15.9,12.3,16,12,16z"></path></svg></span></button><div class="menu" data-v-8f17ebbc><div class="VPMenu" data-v-8f17ebbc data-v-f5acf789><div class="items" data-v-f5acf789><!--[--><!--[--><div class="VPMenuLink" data-v-f5acf789 data-v-5f1b289c><a class="VPLink link" href="/note/JavaScript.html" data-v-5f1b289c><!--[-->JavaScript基础<!--]--></a></div><!--]--><!--[--><div class="VPMenuLink" data-v-f5acf789 data-v-5f1b289c><a class="VPLink link" href="/note/CSS.html" data-v-5f1b289c><!--[-->CSS基础<!--]--></a></div><!--]--><!--[--><div class="VPMenuLink" data-v-f5acf789 data-v-5f1b289c><a class="VPLink link" href="/note/JavaScriptEnhanced.html" data-v-5f1b289c><!--[-->JavaScript进阶<!--]--></a></div><!--]--><!--[--><div class="VPMenuLink" data-v-f5acf789 data-v-5f1b289c><a class="VPLink link" href="/note/Front-end%20Engineering.html" data-v-5f1b289c><!--[-->前端工程化<!--]--></a></div><!--]--><!--[--><div class="VPMenuLink" data-v-f5acf789 data-v-5f1b289c><a class="VPLink link" href="/note/SSR.html" data-v-5f1b289c><!--[-->服务端渲染<!--]--></a></div><!--]--><!--[--><div class="VPMenuLink" data-v-f5acf789 data-v-5f1b289c><a class="VPLink link" href="/note/React.html" data-v-5f1b289c><!--[-->React基础<!--]--></a></div><!--]--><!--[--><div class="VPMenuLink" data-v-f5acf789 data-v-5f1b289c><a class="VPLink link" href="/note/React%20Hooks.html" data-v-5f1b289c><!--[-->React Hooks<!--]--></a></div><!--]--><!--[--><div class="VPMenuLink" data-v-f5acf789 data-v-5f1b289c><a class="VPLink link" href="/note/Redux.html" data-v-5f1b289c><!--[-->Redux<!--]--></a></div><!--]--><!--[--><div class="VPMenuLink" data-v-f5acf789 data-v-5f1b289c><a class="VPLink link" href="/note/React%20Router.html" data-v-5f1b289c><!--[-->React Router<!--]--></a></div><!--]--><!--[--><div class="VPMenuLink" data-v-f5acf789 data-v-5f1b289c><a class="VPLink link" href="/note/MySQL.html" data-v-5f1b289c><!--[-->MySQL<!--]--></a></div><!--]--><!--]--></div><!--[--><!--]--></div></div></div><!--]--><!--[--><a class="VPLink link VPNavBarMenuLink" href="/self/" tabindex="0" data-v-471dd2d2 data-v-79f36db3><!--[--><span data-v-79f36db3>个人介绍</span><!--]--></a><!--]--><!--]--></nav><!----><div class="VPNavBarAppearance appearance" data-v-56b97c0f data-v-11fb0f5b><button class="VPSwitch VPSwitchAppearance" type="button" role="switch" title="toggle dark mode" aria-checked="false" data-v-11fb0f5b data-v-599084b8 data-v-739664f6><span class="check" data-v-739664f6><span class="icon" data-v-739664f6><!--[--><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="sun" data-v-599084b8><path d="M12,18c-3.3,0-6-2.7-6-6s2.7-6,6-6s6,2.7,6,6S15.3,18,12,18zM12,8c-2.2,0-4,1.8-4,4c0,2.2,1.8,4,4,4c2.2,0,4-1.8,4-4C16,9.8,14.2,8,12,8z"></path><path d="M12,4c-0.6,0-1-0.4-1-1V1c0-0.6,0.4-1,1-1s1,0.4,1,1v2C13,3.6,12.6,4,12,4z"></path><path d="M12,24c-0.6,0-1-0.4-1-1v-2c0-0.6,0.4-1,1-1s1,0.4,1,1v2C13,23.6,12.6,24,12,24z"></path><path d="M5.6,6.6c-0.3,0-0.5-0.1-0.7-0.3L3.5,4.9c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l1.4,1.4c0.4,0.4,0.4,1,0,1.4C6.2,6.5,5.9,6.6,5.6,6.6z"></path><path d="M19.8,20.8c-0.3,0-0.5-0.1-0.7-0.3l-1.4-1.4c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l1.4,1.4c0.4,0.4,0.4,1,0,1.4C20.3,20.7,20,20.8,19.8,20.8z"></path><path d="M3,13H1c-0.6,0-1-0.4-1-1s0.4-1,1-1h2c0.6,0,1,0.4,1,1S3.6,13,3,13z"></path><path d="M23,13h-2c-0.6,0-1-0.4-1-1s0.4-1,1-1h2c0.6,0,1,0.4,1,1S23.6,13,23,13z"></path><path d="M4.2,20.8c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l1.4-1.4c0.4-0.4,1-0.4,1.4,0s0.4,1,0,1.4l-1.4,1.4C4.7,20.7,4.5,20.8,4.2,20.8z"></path><path d="M18.4,6.6c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l1.4-1.4c0.4-0.4,1-0.4,1.4,0s0.4,1,0,1.4l-1.4,1.4C18.9,6.5,18.6,6.6,18.4,6.6z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="moon" data-v-599084b8><path d="M12.1,22c-0.3,0-0.6,0-0.9,0c-5.5-0.5-9.5-5.4-9-10.9c0.4-4.8,4.2-8.6,9-9c0.4,0,0.8,0.2,1,0.5c0.2,0.3,0.2,0.8-0.1,1.1c-2,2.7-1.4,6.4,1.3,8.4c2.1,1.6,5,1.6,7.1,0c0.3-0.2,0.7-0.3,1.1-0.1c0.3,0.2,0.5,0.6,0.5,1c-0.2,2.7-1.5,5.1-3.6,6.8C16.6,21.2,14.4,22,12.1,22zM9.3,4.4c-2.9,1-5,3.6-5.2,6.8c-0.4,4.4,2.8,8.3,7.2,8.7c2.1,0.2,4.2-0.4,5.8-1.8c1.1-0.9,1.9-2.1,2.4-3.4c-2.5,0.9-5.3,0.5-7.5-1.1C9.2,11.4,8.1,7.7,9.3,4.4z"></path></svg><!--]--></span></span></button></div><div class="VPSocialLinks VPNavBarSocialLinks social-links" data-v-56b97c0f data-v-293aafa9 data-v-99a410ba><!--[--><a class="VPSocialLink no-icon" href="https://github.com/ZiuChen" aria-label="github" target="_blank" rel="noopener" data-v-99a410ba data-v-72dca3b0><svg role="img" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title>GitHub</title><path d="M12 .297c-6.63 0-12 5.373-12 12 0 5.303 3.438 9.8 8.205 11.385.6.113.82-.258.82-.577 0-.285-.01-1.04-.015-2.04-3.338.724-4.042-1.61-4.042-1.61C4.422 18.07 3.633 17.7 3.633 17.7c-1.087-.744.084-.729.084-.729 1.205.084 1.838 1.236 1.838 1.236 1.07 1.835 2.809 1.305 3.495.998.108-.776.417-1.305.76-1.605-2.665-.3-5.466-1.332-5.466-5.93 0-1.31.465-2.38 1.235-3.22-.135-.303-.54-1.523.105-3.176 0 0 1.005-.322 3.3 1.23.96-.267 1.98-.399 3-.405 1.02.006 2.04.138 3 .405 2.28-1.552 3.285-1.23 3.285-1.23.645 1.653.24 2.873.12 3.176.765.84 1.23 1.91 1.23 3.22 0 4.61-2.805 5.625-5.475 5.92.42.36.81 1.096.81 2.22 0 1.606-.015 2.896-.015 3.286 0 .315.21.69.825.57C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12"/></svg></a><a class="VPSocialLink no-icon" href="https://juejin.cn/user/1887205216238477" aria-label target="_blank" rel="noopener" data-v-99a410ba data-v-72dca3b0><svg width="36" height="28" viewBox="0 0 36 28" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="M17.5875 6.77268L21.8232 3.40505L17.5875 0.00748237L17.5837 0L13.3555 3.39757L17.5837 6.76894L17.5875 6.77268ZM17.5863 17.3955H17.59L28.5161 8.77432L25.5526 6.39453L17.59 12.6808H17.5863L17.5825 12.6845L9.61993 6.40201L6.66016 8.78181L17.5825 17.3992L17.5863 17.3955ZM17.5828 23.2891L17.5865 23.2854L32.2133 11.7456L35.1768 14.1254L28.5238 19.3752L17.5865 28L0.284376 14.3574L0 14.1291L2.95977 11.7531L17.5828 23.2891Z" fill="#1E80FF"/></svg></a><!--]--></div><div class="VPFlyout VPNavBarExtra extra" data-v-56b97c0f data-v-54863f0d data-v-8f17ebbc><button type="button" class="button" aria-haspopup="true" aria-expanded="false" aria-label="extra navigation" data-v-8f17ebbc><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="icon" data-v-8f17ebbc><circle cx="12" cy="12" r="2"></circle><circle cx="19" cy="12" r="2"></circle><circle cx="5" cy="12" r="2"></circle></svg></button><div class="menu" data-v-8f17ebbc><div class="VPMenu" data-v-8f17ebbc data-v-f5acf789><!----><!--[--><!--[--><!----><div class="group" data-v-54863f0d><div class="item appearance" data-v-54863f0d><p class="label" data-v-54863f0d>Appearance</p><div class="appearance-action" data-v-54863f0d><button class="VPSwitch VPSwitchAppearance" type="button" role="switch" title="toggle dark mode" aria-checked="false" data-v-54863f0d data-v-599084b8 data-v-739664f6><span class="check" data-v-739664f6><span class="icon" data-v-739664f6><!--[--><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="sun" data-v-599084b8><path d="M12,18c-3.3,0-6-2.7-6-6s2.7-6,6-6s6,2.7,6,6S15.3,18,12,18zM12,8c-2.2,0-4,1.8-4,4c0,2.2,1.8,4,4,4c2.2,0,4-1.8,4-4C16,9.8,14.2,8,12,8z"></path><path d="M12,4c-0.6,0-1-0.4-1-1V1c0-0.6,0.4-1,1-1s1,0.4,1,1v2C13,3.6,12.6,4,12,4z"></path><path d="M12,24c-0.6,0-1-0.4-1-1v-2c0-0.6,0.4-1,1-1s1,0.4,1,1v2C13,23.6,12.6,24,12,24z"></path><path d="M5.6,6.6c-0.3,0-0.5-0.1-0.7-0.3L3.5,4.9c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l1.4,1.4c0.4,0.4,0.4,1,0,1.4C6.2,6.5,5.9,6.6,5.6,6.6z"></path><path d="M19.8,20.8c-0.3,0-0.5-0.1-0.7-0.3l-1.4-1.4c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l1.4,1.4c0.4,0.4,0.4,1,0,1.4C20.3,20.7,20,20.8,19.8,20.8z"></path><path d="M3,13H1c-0.6,0-1-0.4-1-1s0.4-1,1-1h2c0.6,0,1,0.4,1,1S3.6,13,3,13z"></path><path d="M23,13h-2c-0.6,0-1-0.4-1-1s0.4-1,1-1h2c0.6,0,1,0.4,1,1S23.6,13,23,13z"></path><path d="M4.2,20.8c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l1.4-1.4c0.4-0.4,1-0.4,1.4,0s0.4,1,0,1.4l-1.4,1.4C4.7,20.7,4.5,20.8,4.2,20.8z"></path><path d="M18.4,6.6c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l1.4-1.4c0.4-0.4,1-0.4,1.4,0s0.4,1,0,1.4l-1.4,1.4C18.9,6.5,18.6,6.6,18.4,6.6z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="moon" data-v-599084b8><path d="M12.1,22c-0.3,0-0.6,0-0.9,0c-5.5-0.5-9.5-5.4-9-10.9c0.4-4.8,4.2-8.6,9-9c0.4,0,0.8,0.2,1,0.5c0.2,0.3,0.2,0.8-0.1,1.1c-2,2.7-1.4,6.4,1.3,8.4c2.1,1.6,5,1.6,7.1,0c0.3-0.2,0.7-0.3,1.1-0.1c0.3,0.2,0.5,0.6,0.5,1c-0.2,2.7-1.5,5.1-3.6,6.8C16.6,21.2,14.4,22,12.1,22zM9.3,4.4c-2.9,1-5,3.6-5.2,6.8c-0.4,4.4,2.8,8.3,7.2,8.7c2.1,0.2,4.2-0.4,5.8-1.8c1.1-0.9,1.9-2.1,2.4-3.4c-2.5,0.9-5.3,0.5-7.5-1.1C9.2,11.4,8.1,7.7,9.3,4.4z"></path></svg><!--]--></span></span></button></div></div></div><div class="group" data-v-54863f0d><div class="item social-links" data-v-54863f0d><div class="VPSocialLinks social-links-list" data-v-54863f0d data-v-99a410ba><!--[--><a class="VPSocialLink no-icon" href="https://github.com/ZiuChen" aria-label="github" target="_blank" rel="noopener" data-v-99a410ba data-v-72dca3b0><svg role="img" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title>GitHub</title><path d="M12 .297c-6.63 0-12 5.373-12 12 0 5.303 3.438 9.8 8.205 11.385.6.113.82-.258.82-.577 0-.285-.01-1.04-.015-2.04-3.338.724-4.042-1.61-4.042-1.61C4.422 18.07 3.633 17.7 3.633 17.7c-1.087-.744.084-.729.084-.729 1.205.084 1.838 1.236 1.838 1.236 1.07 1.835 2.809 1.305 3.495.998.108-.776.417-1.305.76-1.605-2.665-.3-5.466-1.332-5.466-5.93 0-1.31.465-2.38 1.235-3.22-.135-.303-.54-1.523.105-3.176 0 0 1.005-.322 3.3 1.23.96-.267 1.98-.399 3-.405 1.02.006 2.04.138 3 .405 2.28-1.552 3.285-1.23 3.285-1.23.645 1.653.24 2.873.12 3.176.765.84 1.23 1.91 1.23 3.22 0 4.61-2.805 5.625-5.475 5.92.42.36.81 1.096.81 2.22 0 1.606-.015 2.896-.015 3.286 0 .315.21.69.825.57C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12"/></svg></a><a class="VPSocialLink no-icon" href="https://juejin.cn/user/1887205216238477" aria-label target="_blank" rel="noopener" data-v-99a410ba data-v-72dca3b0><svg width="36" height="28" viewBox="0 0 36 28" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="M17.5875 6.77268L21.8232 3.40505L17.5875 0.00748237L17.5837 0L13.3555 3.39757L17.5837 6.76894L17.5875 6.77268ZM17.5863 17.3955H17.59L28.5161 8.77432L25.5526 6.39453L17.59 12.6808H17.5863L17.5825 12.6845L9.61993 6.40201L6.66016 8.78181L17.5825 17.3992L17.5863 17.3955ZM17.5828 23.2891L17.5865 23.2854L32.2133 11.7456L35.1768 14.1254L28.5238 19.3752L17.5865 28L0.284376 14.3574L0 14.1291L2.95977 11.7531L17.5828 23.2891Z" fill="#1E80FF"/></svg></a><!--]--></div></div></div><!--]--><!--]--></div></div></div><!--[--><!--]--><button type="button" class="VPNavBarHamburger hamburger" aria-label="mobile navigation" aria-expanded="false" aria-controls="VPNavScreen" data-v-56b97c0f data-v-1b1f6b9e><span class="container" data-v-1b1f6b9e><span class="top" data-v-1b1f6b9e></span><span class="middle" data-v-1b1f6b9e></span><span class="bottom" data-v-1b1f6b9e></span></span></button></div></div></div></div><!----></header><div class="VPLocalNav reached-top" data-v-9d158fda data-v-5d953687><button class="menu" aria-expanded="false" aria-controls="VPSidebarNav" data-v-5d953687><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="menu-icon" data-v-5d953687><path d="M17,11H3c-0.6,0-1-0.4-1-1s0.4-1,1-1h14c0.6,0,1,0.4,1,1S17.6,11,17,11z"></path><path d="M21,7H3C2.4,7,2,6.6,2,6s0.4-1,1-1h18c0.6,0,1,0.4,1,1S21.6,7,21,7z"></path><path d="M21,15H3c-0.6,0-1-0.4-1-1s0.4-1,1-1h18c0.6,0,1,0.4,1,1S21.6,15,21,15z"></path><path d="M17,19H3c-0.6,0-1-0.4-1-1s0.4-1,1-1h14c0.6,0,1,0.4,1,1S17.6,19,17,19z"></path></svg><span class="menu-text" data-v-5d953687>Menu</span></button><div class="VPLocalNavOutlineDropdown" style="--vp-vh:0px;" data-v-5d953687 data-v-989d74b8><button data-v-989d74b8>Return to top</button><!----></div></div><aside class="VPSidebar" data-v-9d158fda data-v-0e1b55d4><div class="curtain" data-v-0e1b55d4></div><nav class="nav" id="VPSidebarNav" aria-labelledby="sidebar-aria-label" tabindex="-1" data-v-0e1b55d4><span class="visually-hidden" id="sidebar-aria-label" data-v-0e1b55d4> Sidebar Navigation </span><!--[--><!--]--><!--[--><div class="group" data-v-0e1b55d4><section class="VPSidebarItem level-0" data-v-0e1b55d4 data-v-4a3e3544><div class="item" role="button" tabindex="0" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><h2 class="text" data-v-4a3e3544>我的项目</h2><!----></div><div class="items" data-v-4a3e3544><!--[--><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/project/ClipboardManager/" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>超级剪贴板</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/project/Markdown/" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>超级Markdown</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/project/JSRunner/" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>超级JavaScript</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/project/SmartWordBreak/" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>超级分词</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-0e1b55d4><section class="VPSidebarItem level-0 collapsible collapsed" data-v-0e1b55d4 data-v-4a3e3544><div class="item" role="button" tabindex="0" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><h2 class="text" data-v-4a3e3544>开源作品</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-4a3e3544><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-4a3e3544><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-4a3e3544><!--[--><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/works/opensource.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>个人作品</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/works/contribution.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>社区贡献</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-0e1b55d4><section class="VPSidebarItem level-0 collapsible has-active" data-v-0e1b55d4 data-v-4a3e3544><div class="item" role="button" tabindex="0" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><h2 class="text" data-v-4a3e3544>文章归档</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-4a3e3544><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-4a3e3544><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-4a3e3544><!--[--><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E3%80%902023%E3%80%91%E9%9D%92%E8%AE%AD%E8%90%A5%20-%20%E5%89%8D%E7%AB%AF%E7%BB%83%E4%B9%A0%E9%A2%98%E6%B1%87%E6%80%BB%E8%A7%A3%E6%9E%90.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>【2023】青训营 - 前端练习题汇总解析</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E3%80%90%E5%AD%97%E8%8A%82%E8%B7%B3%E5%8A%A8%E3%80%91%E5%89%8D%E7%AB%AF%E9%9D%A2%E8%AF%95%E9%A2%98%E6%80%BB%E7%BB%93.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>【字节跳动】前端面试题总结</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E3%80%90%E5%BF%AB%E6%89%8B%E3%80%91%E6%B7%B1%E5%85%A5%E7%90%86%E8%A7%A3%E5%89%8D%E7%AB%AF%E9%9D%A2%E8%AF%95%E9%A2%98.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>【快手】深入理解前端面试题</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E3%80%90%E7%94%A8%E5%8F%8B%E9%87%91%E8%9E%8D%E3%80%91%E5%89%8D%E7%AB%AF%E9%9D%A2%E8%AF%95%E9%A2%98%E6%80%BB%E7%BB%93.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>【用友金融】前端面试题总结</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E4%B8%80%E6%96%87%E8%AF%BB%E6%87%82%E4%BA%8B%E4%BB%B6%E5%86%92%E6%B3%A1%E4%B8%8E%E4%BA%8B%E4%BB%B6%E6%8D%95%E8%8E%B7.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>一文读懂事件冒泡与事件捕获</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E4%B8%80%E6%96%87%E8%AF%BB%E6%87%82%E4%BC%AA%E7%B1%BB%E4%B8%8E%E4%BC%AA%E5%85%83%E7%B4%A0.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>一文读懂伪类与伪元素</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E4%B8%80%E6%96%87%E8%AF%BB%E6%87%82%E5%87%BD%E6%95%B0%E4%B8%ADthis%E6%8C%87%E5%90%91%E9%97%AE%E9%A2%98.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>一文读懂函数中this指向问题</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E4%BB%8E0%E5%AE%9E%E7%8E%B0%E4%B8%80%E4%B8%AA%E5%B9%B4%E5%BA%A6%E6%8A%A5%E5%91%8A.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>从0实现一个年度报告</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E5%BD%BB%E5%BA%95%E6%90%9E%E6%87%82%E5%AF%B9%E8%B1%A1%E7%9A%84%E6%95%B0%E6%8D%AE%E5%B1%9E%E6%80%A7%E6%8F%8F%E8%BF%B0%E7%AC%A6%E3%80%81%E5%AD%98%E5%82%A8%E5%B1%9E%E6%80%A7%E6%8F%8F%E8%BF%B0%E7%AC%A6.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>彻底搞懂对象的数据属性描述符、存储属性描述符</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E6%B5%85%E6%9E%90defineProperty%E4%B8%8EProxy%E5%AE%9E%E7%8E%B0%E7%9A%84%E5%8F%8C%E5%90%91%E7%BB%91%E5%AE%9A.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>浅析defineProperty与Proxy实现的双向绑定</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E6%B7%B1%E5%85%A5JavaScript%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>深入JavaScript数据类型</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E6%B7%B1%E5%85%A5Vue3%E6%BA%90%E7%A0%81%EF%BC%8C%E7%9C%8B%E7%9C%8BVue.use%E5%90%8E%E7%A9%B6%E7%AB%9F%E5%8F%91%E7%94%9F%E4%BA%86%E4%BB%80%E4%B9%88%EF%BC%9F.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>深入Vue3源码，看看Vue.use后究竟发生了什么？</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E6%B7%B1%E5%85%A5%E7%90%86%E8%A7%A3Proxy%E4%B8%8EReflect.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>深入理解Proxy与Reflect</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E6%B7%B1%E5%85%A5%E7%90%86%E8%A7%A3%E6%B5%8F%E8%A7%88%E5%99%A8%E7%BC%93%E5%AD%98%E6%9C%BA%E5%88%B6.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>深入理解浏览器缓存机制</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E6%B7%B1%E5%85%A5%E7%90%86%E8%A7%A3%E6%B5%8F%E8%A7%88%E5%99%A8%E8%BF%90%E8%A1%8C%E5%8E%9F%E7%90%86.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>深入理解浏览器运行原理</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-0e1b55d4><section class="VPSidebarItem level-0 collapsible collapsed" data-v-0e1b55d4 data-v-4a3e3544><div class="item" role="button" tabindex="0" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><h2 class="text" data-v-4a3e3544>学习笔记</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-4a3e3544><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-4a3e3544><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-4a3e3544><!--[--><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/JavaScript.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>JavaScript基础</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/CSS.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>CSS基础</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/JavaScriptEnhanced.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>JavaScript进阶</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/Front-end%20Engineering.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>前端工程化</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/SSR.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>服务端渲染</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/React.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>React基础</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/React%20Hooks.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>React Hooks</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/Redux.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>Redux</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/React%20Router.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>React Router</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/MySQL.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>MySQL</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-9d158fda data-v-585eef7d><div class="VPDoc has-sidebar has-aside" data-v-585eef7d data-v-a686a8a6><!--[--><!--]--><div class="container" data-v-a686a8a6><div class="aside" data-v-a686a8a6><div class="aside-curtain" data-v-a686a8a6></div><div class="aside-container" data-v-a686a8a6><div class="aside-content" data-v-a686a8a6><div class="VPDocAside" data-v-a686a8a6 data-v-31570b60><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-31570b60 data-v-ba8455b5><div class="content" data-v-ba8455b5><div class="outline-marker" data-v-ba8455b5></div><div class="outline-title" role="heading" aria-level="2" data-v-ba8455b5>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-ba8455b5><span class="visually-hidden" id="doc-outline-aria-label" data-v-ba8455b5> Table of Contents for current page </span><ul class="root" data-v-ba8455b5 data-v-6713c9cc><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-31570b60></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-a686a8a6><div class="content-container" data-v-a686a8a6><!--[--><!--]--><!----><main class="main" data-v-a686a8a6><div style="position:relative;" class="vp-doc _article_%E4%B8%80%E6%96%87%E8%AF%BB%E6%87%82%E5%87%BD%E6%95%B0%E4%B8%ADthis%E6%8C%87%E5%90%91%E9%97%AE%E9%A2%98" data-v-a686a8a6><div><h1 id="一文读懂函数中this指向问题" tabindex="-1">一文读懂函数中this指向问题 <a class="header-anchor" href="#一文读懂函数中this指向问题" aria-label="Permalink to "一文读懂函数中this指向问题""></a></h1><h2 id="函数中this指向" tabindex="-1">函数中this指向 <a class="header-anchor" href="#函数中this指向" aria-label="Permalink to "函数中this指向""></a></h2><p>函数在调用时, Javascript会默认为this绑定一个值</p><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">// 定义一个函数</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">function foo() {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">}</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">// 1. 直接调用</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">foo() // Window</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">// 2. 绑定对象调用</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">const obj = { name: 'ziu', aaa: foo }</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">obj.aaa() // obj</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">// 3. 通过call/apply调用</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">foo.call('Ziu') // String {'Ziu'}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">// 定义一个函数</span></span>
|
||
<span class="line"><span style="color:#24292e;">function foo() {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#24292e;">}</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">// 1. 直接调用</span></span>
|
||
<span class="line"><span style="color:#24292e;">foo() // Window</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">// 2. 绑定对象调用</span></span>
|
||
<span class="line"><span style="color:#24292e;">const obj = { name: 'ziu', aaa: foo }</span></span>
|
||
<span class="line"><span style="color:#24292e;">obj.aaa() // obj</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">// 3. 通过call/apply调用</span></span>
|
||
<span class="line"><span style="color:#24292e;">foo.call('Ziu') // String {'Ziu'}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br></div></div><p>this的绑定:</p><ul><li>和定义的位置没有关系</li><li>和调用方式/调用位置有关系</li><li>是在运行时被绑定的</li></ul><p><strong>this始终指向最后调用它的对象</strong></p><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">function foo() {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">}</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">foo() // Window</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">const obj = {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> name: 'ziu',</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> bar: function () {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> }</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">}</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">obj.bar() // obj</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">const baz = obj.bar</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">baz() // Window</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">function foo() {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#24292e;">}</span></span>
|
||
<span class="line"><span style="color:#24292e;">foo() // Window</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">const obj = {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> name: 'ziu',</span></span>
|
||
<span class="line"><span style="color:#24292e;"> bar: function () {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#24292e;"> }</span></span>
|
||
<span class="line"><span style="color:#24292e;">}</span></span>
|
||
<span class="line"><span style="color:#24292e;">obj.bar() // obj</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">const baz = obj.bar</span></span>
|
||
<span class="line"><span style="color:#24292e;">baz() // Window</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br></div></div><h2 id="如何改变this的指向" tabindex="-1">如何改变this的指向 <a class="header-anchor" href="#如何改变this的指向" aria-label="Permalink to "如何改变this的指向""></a></h2><h3 id="new-实例化一个函数" tabindex="-1">new 实例化一个函数 <a class="header-anchor" href="#new-实例化一个函数" aria-label="Permalink to "new 实例化一个函数""></a></h3><blockquote><p>new一个对象时发生了什么:</p><ol start="0"><li>创建一个空对象</li><li>这个空对象会被执行prototype连接</li><li>将this指向这个空对象</li><li>执行函数体中的代码</li><li>没有显式返回这个对象时 会默认返回这个对象</li></ol></blockquote><p>函数可以作为一个构造函数, 作为一个类, 可以通过new关键字将其实例化</p><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">function foo() {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> this.name = 'Ziu'</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">}</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">foo() // 直接调用的话 this为Window</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">new foo() // 通过new关键字调用 则this指向空对象</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">function foo() {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#24292e;"> this.name = 'Ziu'</span></span>
|
||
<span class="line"><span style="color:#24292e;">}</span></span>
|
||
<span class="line"><span style="color:#24292e;">foo() // 直接调用的话 this为Window</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">new foo() // 通过new关键字调用 则this指向空对象</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><h3 id="使用-call-apply-bind" tabindex="-1">使用 call apply bind <a class="header-anchor" href="#使用-call-apply-bind" aria-label="Permalink to "使用 call apply bind""></a></h3><p>在 JavaScript 中, 函数是对象。</p><p>JavaScript 函数有它的属性和方法。call() 和 apply() 是预定义的函数方法。</p><p>两个方法可用于调用函数，两个方法的第一个参数必须是对象本身</p><hr><p>要将<code>foo</code>函数中的<code>this</code>指向<code>obj</code>，可以通过赋值的方式：</p><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">obj.foo = foo // 绑定</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">obj.foo() // 调用</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">obj.foo = foo // 绑定</span></span>
|
||
<span class="line"><span style="color:#24292e;">obj.foo() // 调用</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>但是也可以通过对函数调用call / apply实现</p><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">var obj = {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> name: 'Ziu'</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">}</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">function foo() {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">}</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">foo.call(obj) // 将foo执行时的this显式绑定到了obj上 并调用foo</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">foo.call(123) // foo的this被绑定到了 Number { 123 } 上</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">foo.call("ziu") // 绑定到了 String { "ziu" } 上</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">var obj = {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> name: 'Ziu'</span></span>
|
||
<span class="line"><span style="color:#24292e;">}</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">function foo() {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#24292e;">}</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">foo.call(obj) // 将foo执行时的this显式绑定到了obj上 并调用foo</span></span>
|
||
<span class="line"><span style="color:#24292e;">foo.call(123) // foo的this被绑定到了 Number { 123 } 上</span></span>
|
||
<span class="line"><span style="color:#24292e;">foo.call("ziu") // 绑定到了 String { "ziu" } 上</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><h4 id="包装类对象" tabindex="-1">包装类对象 <a class="header-anchor" href="#包装类对象" aria-label="Permalink to "包装类对象""></a></h4><p>当我们直接使用类似：</p><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">"ZiuChen".length // String.length</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">"ZiuChen".length // String.length</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><p>的语句时，<code>JS</code>会为字符串 <code>ZiuChen</code> 包装一个对象，随后在这个对象上调用 <code>.length</code> 属性</p><h4 id="call和apply的区别" tabindex="-1">call和apply的区别 <a class="header-anchor" href="#call和apply的区别" aria-label="Permalink to "call和apply的区别""></a></h4><ul><li><p>相同点：第一个参数都是相同的，要求传入一个对象</p><ul><li>在函数调用时，会将this绑定到这个传入的对象上</li></ul></li><li><p>不同点：后面的参数</p><ul><li>apply 传入的是一个数组</li><li>call 传入的是参数列表</li></ul></li></ul><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">function foo(name, age, height) {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">}</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">foo('Ziu', 18, 1.88)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">foo.apply('targetThis', 'Ziu', 18, 1.88)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">foo.call('targetThis', ['Ziu', 18, 1.88])</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">function foo(name, age, height) {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#24292e;">}</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">foo('Ziu', 18, 1.88)</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">foo.apply('targetThis', 'Ziu', 18, 1.88)</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">foo.call('targetThis', ['Ziu', 18, 1.88])</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>当我们需要给一个带参数的函数通过call/apply的方式绑定this时，就需要使用到call/apply的第二个入参了。</p><h4 id="参数列表" tabindex="-1">参数列表 <a class="header-anchor" href="#参数列表" aria-label="Permalink to "参数列表""></a></h4><p>当传入函数的参数有多个时，可以通过<code>...args</code>将参数合并到一个数组中去</p><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">function foo(...args) {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> console.log(args)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">}</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">foo("Ziu", 18, 1.88) // ["Ziu", 18, 1.88]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">function foo(...args) {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> console.log(args)</span></span>
|
||
<span class="line"><span style="color:#24292e;">}</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">foo("Ziu", 18, 1.88) // ["Ziu", 18, 1.88]</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><h4 id="bind绑定" tabindex="-1">bind绑定 <a class="header-anchor" href="#bind绑定" aria-label="Permalink to "bind绑定""></a></h4><p>如果我们希望：在每次调用<code>foo</code>时，都能将<code>obj</code>绑定到<code>foo</code>的<code>this</code>上，那么就需要用到<code>bind</code></p><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">// 将obj绑定到foo上</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">const fun = foo.bind(obj)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">// 在后续每次调用foo时, foo内的this都将指向obj</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">fun() // obj</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">fun() // obj</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">// 将obj绑定到foo上</span></span>
|
||
<span class="line"><span style="color:#24292e;">const fun = foo.bind(obj)</span></span>
|
||
<span class="line"><span style="color:#24292e;">// 在后续每次调用foo时, foo内的this都将指向obj</span></span>
|
||
<span class="line"><span style="color:#24292e;">fun() // obj</span></span>
|
||
<span class="line"><span style="color:#24292e;">fun() // obj</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p><code>bind()</code>方法将创建一个新的函数，当被调用时，将其<code>this</code>关键字</p><h2 id="箭头函数" tabindex="-1">箭头函数 <a class="header-anchor" href="#箭头函数" aria-label="Permalink to "箭头函数""></a></h2><p>箭头函数是<code>ES6</code>新增的编写函数的方式，更简洁。</p><ul><li>箭头函数不会绑定<code>this</code>、<code>argument</code>属性</li><li>箭头函数不能作为构造函数来使用（不能与<code>new</code>同用，会报错）</li></ul><h3 id="箭头函数中的this" tabindex="-1">箭头函数中的this <a class="header-anchor" href="#箭头函数中的this" aria-label="Permalink to "箭头函数中的this""></a></h3><p>在箭头函数中是没有<code>this</code>的：</p><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">const foo = () => {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">}</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">foo() // window</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">console.log(this) // window</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">const foo = () => {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#24292e;">}</span></span>
|
||
<span class="line"><span style="color:#24292e;">foo() // window</span></span>
|
||
<span class="line"><span style="color:#24292e;">console.log(this) // window</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>之所以找到了<code>Window</code>对象，是因为在调用<code>foo()</code>时，函数内部作用域并没有找到<code>this</code>，转而向上层作用域找<code>this</code></p><p>因此找到了顶层的全局<code>this</code>，也即<code>Window</code>对象</p><h3 id="箭头函数中this的查找规则" tabindex="-1">箭头函数中this的查找规则 <a class="header-anchor" href="#箭头函数中this的查找规则" aria-label="Permalink to "箭头函数中this的查找规则""></a></h3><p>检查以下代码：</p><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">const obj = {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> name: "obj",</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> foo: function () {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> const bar = () => {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> }</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> return bar</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> }</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">}</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">const fn = obj.foo()</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">fn() // obj</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">const obj = {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> name: "obj",</span></span>
|
||
<span class="line"><span style="color:#24292e;"> foo: function () {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> const bar = () => {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#24292e;"> }</span></span>
|
||
<span class="line"><span style="color:#24292e;"> return bar</span></span>
|
||
<span class="line"><span style="color:#24292e;"> }</span></span>
|
||
<span class="line"><span style="color:#24292e;">}</span></span>
|
||
<span class="line"><span style="color:#24292e;">const fn = obj.foo()</span></span>
|
||
<span class="line"><span style="color:#24292e;">fn() // obj</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><p>代码执行完毕，控制台输出<code>this</code>值为<code>obj</code>对象，这是为什么？</p><p>箭头函数中没有<code>this</code>，故会向上层作用域寻找<code>this</code>，<code>bar</code>的上层作用域为函数<code>foo</code>，而函数<code>foo</code>的<code>this</code>由其调用决定</p><p>调用<code>foo</code>函数的为<code>obj</code>对象，故内部箭头函数中的<code>this</code>指向的是<code>obj</code></p><p>检查以下代码：</p><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">const obj = {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> name: "obj",</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> foo: () => {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> const bar = () => {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> }</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> return bar</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> }</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">}</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">const fn = obj.foo()</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">fn() // Window</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">const obj = {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> name: "obj",</span></span>
|
||
<span class="line"><span style="color:#24292e;"> foo: () => {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> const bar = () => {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> console.log(this)</span></span>
|
||
<span class="line"><span style="color:#24292e;"> }</span></span>
|
||
<span class="line"><span style="color:#24292e;"> return bar</span></span>
|
||
<span class="line"><span style="color:#24292e;"> }</span></span>
|
||
<span class="line"><span style="color:#24292e;">}</span></span>
|
||
<span class="line"><span style="color:#24292e;">const fn = obj.foo()</span></span>
|
||
<span class="line"><span style="color:#24292e;">fn() // Window</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><p>和上面的代码不同之处在于：<code>foo</code>也是由箭头函数定义的，<code>bar</code>向上找不到<code>foo</code>的<code>this</code>，故而继续向上，找到了全局<code>this</code>，也即<code>Window</code>对象</p><h3 id="严格模式" tabindex="-1">严格模式 <a class="header-anchor" href="#严格模式" aria-label="Permalink to "严格模式""></a></h3><ul><li>在严格模式下，全局的<code>this</code>不是<code>Window</code>对象，而是<code>undefined</code>。</li><li>在 JavaScript 严格模式(strict mode)下, 在调用函数时第一个参数会成为 this 的值， 即使该参数不是一个对象。</li><li>在 JavaScript 非严格模式(non-strict mode)下, 如果第一个参数的值是 null 或 undefined, 它将使用全局对象替代。</li></ul><h2 id="this面试题" tabindex="-1">this面试题 <a class="header-anchor" href="#this面试题" aria-label="Permalink to "this面试题""></a></h2><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">var name = 'window'</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">var person = {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> name: 'person',</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> sayName: function () {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> console.log(this.name)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> }</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">}</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">function sayName() {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> var sss = person.sayName</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> sss() // 默认绑定: window</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> person.sayName(); // 隐式绑定: person</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> (person.sayName)() // 隐式绑定: person, 本质与上一行代码相同</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> ;(person.sayName = person.sayName)() // 间接调用: window</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">}</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">sayName()</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">var name = 'window'</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">var person = {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> name: 'person',</span></span>
|
||
<span class="line"><span style="color:#24292e;"> sayName: function () {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> console.log(this.name)</span></span>
|
||
<span class="line"><span style="color:#24292e;"> }</span></span>
|
||
<span class="line"><span style="color:#24292e;">}</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">function sayName() {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> var sss = person.sayName</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;"> sss() // 默认绑定: window</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;"> person.sayName(); // 隐式绑定: person</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;"> (person.sayName)() // 隐式绑定: person, 本质与上一行代码相同</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;"> ;(person.sayName = person.sayName)() // 间接调用: window</span></span>
|
||
<span class="line"><span style="color:#24292e;">}</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">sayName()</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br></div></div><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">var name = 'window'</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">var person1 = {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> name: 'person1',</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> foo1: function () {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> console.log(this.name)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> },</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> foo2: () => console.log(this.name),</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> foo3: function () {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> return function () {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> console.log(this.name)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> }</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> },</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> foo4: function () {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> return () => console.log(this.name)</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> }</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">}</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">var person2 = {</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"> name: 'person2'</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">}</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">person1.foo1() // 隐式绑定: person1</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">person1.foo1.call(person2) // 显式绑定: person2</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">person1.foo2() // 上层作用域: window</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">person1.foo2.call(person2) // 上层作用域: window</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">person1.foo3()() // 默认绑定: window</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">person1.foo3.call(person2)() // 默认绑定: window</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">person1.foo3().call(person2) // 显式绑定: person2</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;"></span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">person1.foo4()() // 隐式绑定: person1</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">person1.foo4.call(person2)() // 显式绑定: person2</span></span>
|
||
<span class="line"><span style="color:#e1e4e8;">person1.foo4().call(person2) // 隐式绑定: person1</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">var name = 'window'</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">var person1 = {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> name: 'person1',</span></span>
|
||
<span class="line"><span style="color:#24292e;"> foo1: function () {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> console.log(this.name)</span></span>
|
||
<span class="line"><span style="color:#24292e;"> },</span></span>
|
||
<span class="line"><span style="color:#24292e;"> foo2: () => console.log(this.name),</span></span>
|
||
<span class="line"><span style="color:#24292e;"> foo3: function () {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> return function () {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> console.log(this.name)</span></span>
|
||
<span class="line"><span style="color:#24292e;"> }</span></span>
|
||
<span class="line"><span style="color:#24292e;"> },</span></span>
|
||
<span class="line"><span style="color:#24292e;"> foo4: function () {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> return () => console.log(this.name)</span></span>
|
||
<span class="line"><span style="color:#24292e;"> }</span></span>
|
||
<span class="line"><span style="color:#24292e;">}</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">var person2 = {</span></span>
|
||
<span class="line"><span style="color:#24292e;"> name: 'person2'</span></span>
|
||
<span class="line"><span style="color:#24292e;">}</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">person1.foo1() // 隐式绑定: person1</span></span>
|
||
<span class="line"><span style="color:#24292e;">person1.foo1.call(person2) // 显式绑定: person2</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">person1.foo2() // 上层作用域: window</span></span>
|
||
<span class="line"><span style="color:#24292e;">person1.foo2.call(person2) // 上层作用域: window</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">person1.foo3()() // 默认绑定: window</span></span>
|
||
<span class="line"><span style="color:#24292e;">person1.foo3.call(person2)() // 默认绑定: window</span></span>
|
||
<span class="line"><span style="color:#24292e;">person1.foo3().call(person2) // 显式绑定: person2</span></span>
|
||
<span class="line"><span style="color:#24292e;"></span></span>
|
||
<span class="line"><span style="color:#24292e;">person1.foo4()() // 隐式绑定: person1</span></span>
|
||
<span class="line"><span style="color:#24292e;">person1.foo4.call(person2)() // 显式绑定: person2</span></span>
|
||
<span class="line"><span style="color:#24292e;">person1.foo4().call(person2) // 隐式绑定: person1</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br></div></div></div></div></main><footer class="VPDocFooter" data-v-a686a8a6 data-v-0b8e2cba><!--[--><!--]--><div class="edit-info" data-v-0b8e2cba><div class="edit-link" data-v-0b8e2cba><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/ZiuChen/ZiuChen.github.io/edit/main/docs/article/一文读懂函数中this指向问题.md" target="_blank" rel="noreferrer" data-v-0b8e2cba><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-0b8e2cba><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page on GitHub<!--]--></a></div><div class="last-updated" data-v-0b8e2cba><p class="VPLastUpdated" data-v-0b8e2cba data-v-a6f11a31>Updated Date: <time datetime="2024-01-06T06:57:39.000Z" data-v-a6f11a31></time></p></div></div><nav class="prev-next" data-v-0b8e2cba><div class="pager" data-v-0b8e2cba><a class="pager-link prev" href="/article/%E4%B8%80%E6%96%87%E8%AF%BB%E6%87%82%E4%BC%AA%E7%B1%BB%E4%B8%8E%E4%BC%AA%E5%85%83%E7%B4%A0.html" data-v-0b8e2cba><span class="desc" data-v-0b8e2cba>Previous page</span><span class="title" data-v-0b8e2cba>一文读懂伪类与伪元素</span></a></div><div class="pager" data-v-0b8e2cba><a class="pager-link next" href="/article/%E4%BB%8E0%E5%AE%9E%E7%8E%B0%E4%B8%80%E4%B8%AA%E5%B9%B4%E5%BA%A6%E6%8A%A5%E5%91%8A.html" data-v-0b8e2cba><span class="desc" data-v-0b8e2cba>Next page</span><span class="title" data-v-0b8e2cba>从0实现一个年度报告</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-9d158fda data-v-2c80950a><div class="container" data-v-2c80950a><p class="message" data-v-2c80950a>Released under the MIT License.</p><p class="copyright" data-v-2c80950a>Copyright © 2019-present Ziu Chen</p></div></footer><!--[--><!--]--></div></div>
|
||
<script>window.__VP_HASH_MAP__=JSON.parse("{\"index.md\":\"48a36636\",\"article_浅析defineproperty与proxy实现的双向绑定.md\":\"13ed773f\",\"article_一文读懂事件冒泡与事件捕获.md\":\"d1929e50\",\"article_深入理解浏览器缓存机制.md\":\"69e6a2c6\",\"article_一文读懂函数中this指向问题.md\":\"28d5e9b4\",\"article_深入javascript数据类型.md\":\"477ee358\",\"note_css.md\":\"fbe56ac3\",\"article_深入理解浏览器运行原理.md\":\"a9684ca4\",\"note_redux.md\":\"02de7bbe\",\"project_smartwordbreak_index.md\":\"66a30ca5\",\"note_javascript.md\":\"45a113ba\",\"article_【快手】深入理解前端面试题.md\":\"d44b9955\",\"article_【字节跳动】前端面试题总结.md\":\"30e03a5f\",\"article_【用友金融】前端面试题总结.md\":\"6d315a97\",\"article_深入vue3源码，看看vue.use后究竟发生了什么？.md\":\"70bae50e\",\"article_一文读懂伪类与伪元素.md\":\"68cce63a\",\"article_从0实现一个年度报告.md\":\"175c992f\",\"article_深入理解proxy与reflect.md\":\"fdad28fc\",\"project_jsrunner_log_index.md\":\"5b2edea9\",\"note_react router.md\":\"8d4994d8\",\"project_clipboardmanager_statement_index.md\":\"158b6468\",\"project_jsrunner_index.md\":\"d62a7429\",\"project_markdown_index.md\":\"5a93c50a\",\"article_【2023】青训营 - 前端练习题汇总解析.md\":\"dd1797c0\",\"project_clipboardmanager_log_index.md\":\"30d348e4\",\"project_clipboardmanager_index.md\":\"a4052946\",\"article_彻底搞懂对象的数据属性描述符、存储属性描述符.md\":\"dd182e72\",\"project_smartwordbreak_log_index.md\":\"6c6fe4e0\",\"project_smartwordbreak_statement_index.md\":\"33bd8d5d\",\"note_mysql.md\":\"45f0f4c7\",\"works_contribution.md\":\"997cb34f\",\"works_opensource.md\":\"db24f357\",\"project_markdown_shortcut_index.md\":\"90359831\",\"project_clipboardmanager_guide_index.md\":\"3c3d400d\",\"project_markdown_log_index.md\":\"bb95b786\",\"note_front-end engineering.md\":\"75c88456\",\"note_ssr.md\":\"ee0ee312\",\"self_index.md\":\"82f653ee\",\"note_react hooks.md\":\"7a05a70a\",\"note_react.md\":\"f9ad4dc2\",\"note_javascriptenhanced.md\":\"f1655783\"}");window.__VP_SITE_DATA__=JSON.parse("{\"lang\":\"en-US\",\"dir\":\"ltr\",\"title\":\"ZiuChen\",\"description\":\"Unlimited Progress.\",\"base\":\"/\",\"head\":[],\"appearance\":true,\"themeConfig\":{\"logo\":\"/logo.png\",\"nav\":[{\"text\":\"首页\",\"link\":\"/\"},{\"text\":\"我的项目\",\"items\":[{\"text\":\"超级剪贴板\",\"link\":\"/project/ClipboardManager/\"},{\"text\":\"超级Markdown\",\"link\":\"/project/Markdown/\"},{\"text\":\"超级JavaScript\",\"link\":\"/project/JSRunner/\"},{\"text\":\"超级分词\",\"link\":\"/project/SmartWordBreak/\"}]},{\"text\":\"开源作品\",\"items\":[{\"text\":\"个人作品\",\"link\":\"/works/opensource\"},{\"text\":\"社区贡献\",\"link\":\"/works/contribution\"}]},{\"text\":\"学习笔记\",\"items\":[{\"text\":\"JavaScript基础\",\"link\":\"/note/JavaScript\"},{\"text\":\"CSS基础\",\"link\":\"/note/CSS\"},{\"text\":\"JavaScript进阶\",\"link\":\"/note/JavaScriptEnhanced\"},{\"text\":\"前端工程化\",\"link\":\"/note/Front-end Engineering\"},{\"text\":\"服务端渲染\",\"link\":\"/note/SSR\"},{\"text\":\"React基础\",\"link\":\"/note/React\"},{\"text\":\"React Hooks\",\"link\":\"/note/React Hooks\"},{\"text\":\"Redux\",\"link\":\"/note/Redux\"},{\"text\":\"React Router\",\"link\":\"/note/React Router\"},{\"text\":\"MySQL\",\"link\":\"/note/MySQL\"}]},{\"text\":\"个人介绍\",\"link\":\"/self/\"}],\"sidebar\":[{\"text\":\"我的项目\",\"items\":[{\"text\":\"超级剪贴板\",\"link\":\"/project/ClipboardManager/\"},{\"text\":\"超级Markdown\",\"link\":\"/project/Markdown/\"},{\"text\":\"超级JavaScript\",\"link\":\"/project/JSRunner/\"},{\"text\":\"超级分词\",\"link\":\"/project/SmartWordBreak/\"}]},{\"text\":\"开源作品\",\"collapsed\":true,\"items\":[{\"text\":\"个人作品\",\"link\":\"/works/opensource\"},{\"text\":\"社区贡献\",\"link\":\"/works/contribution\"}]},{\"text\":\"文章归档\",\"collapsed\":true,\"items\":[{\"text\":\"【2023】青训营 - 前端练习题汇总解析\",\"link\":\"/article/【2023】青训营 - 前端练习题汇总解析\"},{\"text\":\"【字节跳动】前端面试题总结\",\"link\":\"/article/【字节跳动】前端面试题总结\"},{\"text\":\"【快手】深入理解前端面试题\",\"link\":\"/article/【快手】深入理解前端面试题\"},{\"text\":\"【用友金融】前端面试题总结\",\"link\":\"/article/【用友金融】前端面试题总结\"},{\"text\":\"一文读懂事件冒泡与事件捕获\",\"link\":\"/article/一文读懂事件冒泡与事件捕获\"},{\"text\":\"一文读懂伪类与伪元素\",\"link\":\"/article/一文读懂伪类与伪元素\"},{\"text\":\"一文读懂函数中this指向问题\",\"link\":\"/article/一文读懂函数中this指向问题\"},{\"text\":\"从0实现一个年度报告\",\"link\":\"/article/从0实现一个年度报告\"},{\"text\":\"彻底搞懂对象的数据属性描述符、存储属性描述符\",\"link\":\"/article/彻底搞懂对象的数据属性描述符、存储属性描述符\"},{\"text\":\"浅析defineProperty与Proxy实现的双向绑定\",\"link\":\"/article/浅析defineProperty与Proxy实现的双向绑定\"},{\"text\":\"深入JavaScript数据类型\",\"link\":\"/article/深入JavaScript数据类型\"},{\"text\":\"深入Vue3源码，看看Vue.use后究竟发生了什么？\",\"link\":\"/article/深入Vue3源码，看看Vue.use后究竟发生了什么？\"},{\"text\":\"深入理解Proxy与Reflect\",\"link\":\"/article/深入理解Proxy与Reflect\"},{\"text\":\"深入理解浏览器缓存机制\",\"link\":\"/article/深入理解浏览器缓存机制\"},{\"text\":\"深入理解浏览器运行原理\",\"link\":\"/article/深入理解浏览器运行原理\"}]},{\"text\":\"学习笔记\",\"collapsed\":true,\"items\":[{\"text\":\"JavaScript基础\",\"link\":\"/note/JavaScript\"},{\"text\":\"CSS基础\",\"link\":\"/note/CSS\"},{\"text\":\"JavaScript进阶\",\"link\":\"/note/JavaScriptEnhanced\"},{\"text\":\"前端工程化\",\"link\":\"/note/Front-end Engineering\"},{\"text\":\"服务端渲染\",\"link\":\"/note/SSR\"},{\"text\":\"React基础\",\"link\":\"/note/React\"},{\"text\":\"React Hooks\",\"link\":\"/note/React Hooks\"},{\"text\":\"Redux\",\"link\":\"/note/Redux\"},{\"text\":\"React Router\",\"link\":\"/note/React Router\"},{\"text\":\"MySQL\",\"link\":\"/note/MySQL\"}]}],\"socialLinks\":[{\"icon\":\"github\",\"link\":\"https://github.com/ZiuChen\"},{\"icon\":{\"svg\":\"<svg width=\\\"36\\\" height=\\\"28\\\" viewBox=\\\"0 0 36 28\\\" fill=\\\"none\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\"><path fill-rule=\\\"evenodd\\\" clip-rule=\\\"evenodd\\\" d=\\\"M17.5875 6.77268L21.8232 3.40505L17.5875 0.00748237L17.5837 0L13.3555 3.39757L17.5837 6.76894L17.5875 6.77268ZM17.5863 17.3955H17.59L28.5161 8.77432L25.5526 6.39453L17.59 12.6808H17.5863L17.5825 12.6845L9.61993 6.40201L6.66016 8.78181L17.5825 17.3992L17.5863 17.3955ZM17.5828 23.2891L17.5865 23.2854L32.2133 11.7456L35.1768 14.1254L28.5238 19.3752L17.5865 28L0.284376 14.3574L0 14.1291L2.95977 11.7531L17.5828 23.2891Z\\\" fill=\\\"#1E80FF\\\"/></svg>\"},\"link\":\"https://juejin.cn/user/1887205216238477\"}],\"editLink\":{\"pattern\":\"https://github.com/ZiuChen/ZiuChen.github.io/edit/main/docs/:path\",\"text\":\"Edit this page on GitHub\"},\"footer\":{\"message\":\"Released under the MIT License.\",\"copyright\":\"Copyright © 2019-present Ziu Chen\"},\"lastUpdatedText\":\"Updated Date\",\"search\":{\"provider\":\"algolia\",\"options\":{\"appId\":\"LFZ2CPWWUG\",\"apiKey\":\"b4fd296ea5e467b3ac4a582160ff3122\",\"indexName\":\"ziuchenio\"}}},\"locales\":{},\"scrollOffset\":90,\"cleanUrls\":false}");</script>
|
||
|
||
</body>
|
||
</html> |