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data-v-e96c2f33><!--[--><p class="text" data-v-e96c2f33>深入理解浏览器缓存机制</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-e96c2f33 data-v-e96c2f33><div class="item" data-v-e96c2f33><div class="indicator" data-v-e96c2f33></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-e96c2f33><!--[--><p class="text" data-v-e96c2f33>深入理解浏览器运行原理</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-21197ea5 data-v-f1f2fe3a><div class="VPDoc has-sidebar has-aside" data-v-f1f2fe3a data-v-68dddeb0><!--[--><!--]--><div class="container" data-v-68dddeb0><div class="aside" data-v-68dddeb0><div class="aside-curtain" data-v-68dddeb0></div><div class="aside-container" data-v-68dddeb0><div class="aside-content" data-v-68dddeb0><div class="VPDocAside" data-v-68dddeb0 data-v-a0d61c69><!--[--><!--]--><!--[--><!--]--><nav aria-labelledby="doc-outline-aria-label" class="VPDocAsideOutline" data-v-a0d61c69 data-v-6b6b3b01><div class="content" data-v-6b6b3b01><div class="outline-marker" data-v-6b6b3b01></div><div aria-level="2" class="outline-title" id="doc-outline-aria-label" role="heading" data-v-6b6b3b01>On this page</div><ul class="VPDocOutlineItem root" data-v-6b6b3b01 data-v-e1f04456><!--[--><!--]--></ul></div></nav><!--[--><!--]--><div class="spacer" data-v-a0d61c69></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-68dddeb0><div class="content-container" data-v-68dddeb0><!--[--><!--]--><main class="main" data-v-68dddeb0><div style="position:relative;" class="vp-doc _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" data-v-68dddeb0><div><h1 id="深入vue3源码-看看vue-use后究竟发生了什么" tabindex="-1">深入Vue3源码，看看Vue.use后究竟发生了什么？ <a class="header-anchor" href="#深入vue3源码-看看vue-use后究竟发生了什么" aria-label="Permalink to "深入Vue3源码，看看Vue.use后究竟发生了什么？""></a></h1><h2 id="从全局注册组件库入手" tabindex="-1">从全局注册组件库入手 <a class="header-anchor" href="#从全局注册组件库入手" aria-label="Permalink to "从全局注册组件库入手""></a></h2><p>如果我们自定义了几个自定义组件，当我们想在<code>.vue</code>文件中使用它们时，需要手动<code>import</code>导入组件并在<code>component</code>中注册：</p><div class="language-html vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">html</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"><</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">script</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">></span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> CustomInput </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> '@/component/CustomInput.vue'</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> default</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> component: {</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> CustomInput</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"></</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">script</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">></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>通过<code>Vue.use</code>将<code>ElementPlus</code>全局注册后，所有的组件都可以在<code>.vue</code>的<code><template></code>标签中直接使用，不需要再导入、注册。</p><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ElementPlus </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 'element-plus'</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">Vue.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">use</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(ElementPlus)</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>这个过程里<code>Vue.use</code>究竟为我们做了哪些事？</p><p>假设我此时有两个自定义组件<code>ZiuInput</code>与<code>ZiuButton</code>位于<code>@/module/ZiuUI/component</code>目录下，我希望能通过<code>Vue.use</code>达到像<code>ElementPlus</code>那样免导入注册就能直接使用的效果。</p><p>于是我在<code>ZiuUI</code>目录下创建了<code>index.js</code>，并在其中编写以下代码：</p><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// @/module/ZiuUI/index.js</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ZiuInput </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> './component/ziu-input.vue'</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ZiuButton </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> './component/ziu-button.vue'</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> components</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> [ ZiuInput, ZiuButton ]</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> ZiuUI</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
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<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> install</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">Vue</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 注册组件</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> components.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">forEach</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">component</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Vue.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">component</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(component.name, component)</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> })</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> default</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ZiuUI</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></div></div><p>当我们将<code>ZiuUI</code>这个对象传给<code>Vue.use()</code>时，<code>Vue</code>会自动调用其中的<code>install</code>方法，并将<code>Vue</code>实例传入其中，那么我们就可以在<code>install</code>方法中实现组件的全局注册。</p><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// @/main.js</span></span>
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<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Vue </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 'vue'</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> App </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> './App'</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ZiuUI </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> './module/ZiuUI'</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">Vue.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">use</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(ZiuUI) </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// 将ZiuUI传入Vue.use()</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">...</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></div></div><h2 id="深入源码" tabindex="-1">深入源码 <a class="header-anchor" href="#深入源码" aria-label="Permalink to "深入源码""></a></h2><p>下载Vue3的源码阅读，我们可以发现<code>use</code>相关的代码：</p><div class="language-ts vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">ts</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> use</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(plugin: Plugin, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">...</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">options: any[]) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 组件已经被安装了 若是开发环境 则抛出警告</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> (installedPlugins.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">has</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(plugin)) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> __DEV__ </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">&&</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> warn</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">`Plugin has already been applied to target app.`</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 组件未安装 且install方法为函数 那么执行安装 并调用install方法</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // installedPlugins是一个Set 用于记录已经安装的组件</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> else</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> (plugin </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">&&</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> isFunction</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(plugin.install)) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> installedPlugins.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">add</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(plugin)</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> plugin.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">install</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(app, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">...</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">options)</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 传入Vue.use本身就是一个函数 那么执行这个函数</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> else</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> (</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">isFunction</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(plugin)) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> installedPlugins.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">add</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(plugin)</span></span>
|
||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> plugin</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(app, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">...</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">options)</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 如果当前为开发环境 且Vue.use未传参 则抛出警告</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> else</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> (__DEV__) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> warn</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span></span>
|
||
<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> `A plugin must either be a function or an object with an "install" `</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> +</span></span>
|
||
<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> `function.`</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> )</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 执行结束 返回App本身便于链式调用</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> app</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</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></div></div><h2 id="手动引入-注册组件" tabindex="-1">手动引入&注册组件 <a class="header-anchor" href="#手动引入-注册组件" aria-label="Permalink to "手动引入&注册组件""></a></h2><p>有时候，我们不希望全局注册一个组件库，导致整个项目体积变得巨大，而是希望能只引入某些用到的组件，但是又不想用到一个组件就需要手动的导入、注册。</p><p>除了使用组件库提供的自动导入插件，我们还可以手动实现一个“半自动导入组件”的功能。</p><p>编写一个<code>register-element.ts</code>文件，将所有我们项目中需要用到的组件都在此文件中引入并注册。</p><div class="language-ts vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">ts</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// register-element.ts</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">declare</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> require</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">moduleName</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">:</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> string</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">:</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> void</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> type</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { App } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 'vue'</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 'element-plus/theme-chalk/base.css'</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 'element-plus/theme-chalk/dark/css-vars.css'</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 'element-plus/theme-chalk/el-loading.css'</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ElButton,</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ElTabs,</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ElTabPane</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">} </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 'element-plus'</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> components</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> [</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ElButton,</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ElTabs,</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ElTabPane</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">]</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> default</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> registerElement</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">app</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">:</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> App</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">:</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> void</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> components.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">forEach</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">((</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">c</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> name</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> transferCamel</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(c.name)</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 引入组件样式 将驼峰改为-分隔命名</span></span>
|
||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> require</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">`element-plus/theme-chalk/${</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">name</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">}.css`</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 注册组件</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> app.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">component</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(name, c)</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> })</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> transferCamel</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">camel</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">:</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> string</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">:</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> string</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> camel</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> .</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">replace</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">/</span><span style="--shiki-light:#032F62;--shiki-dark:#DBEDFF;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">[A-Z]</span><span style="--shiki-light:#032F62;--shiki-dark:#DBEDFF;">)</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">/</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">g</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">'-$1'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> .</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">toLowerCase</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">()</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> .</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">slice</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</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><span class="line-number">36</span><br></div></div><p>阅读完源码我们发现，如果为<code>Vue.use()</code>传入的是一个函数，那么Vue会将app实例传入并调用这个函数。因此，我们只需要在<code>main.ts</code>中在<code>App</code>实例上链式调用<code>.use</code>方法，并将<code>registerElement</code>函数传入，那么Vue会自动将<code>app</code>实例传入并调用这个方法：</p><div class="language-ts vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">ts</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// main.ts</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { createApp } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 'vue'</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> App </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> './App.vue'</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> registerElement </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> './global/register-element.ts'</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> app</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> createApp</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(App).</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">use</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(registerElement)</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">app.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">mount</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">'#app'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</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></div></div><p>当有新的需要使用的组件时，只需要到<code>register-element.ts</code>文件中引入一次即可。</p><h2 id="参考阅读" tabindex="-1">参考阅读 <a class="header-anchor" href="#参考阅读" aria-label="Permalink to "参考阅读""></a></h2><p><a href="https://vuejs.org/api/application.html#app-use" target="_blank" rel="noreferrer">Vue文档: App.use</a></p><p><a href="https://vuejs.org/guide/reusability/plugins.html" target="_blank" rel="noreferrer">Vue文档: Plugins</a></p></div></div></main><footer class="VPDocFooter" data-v-68dddeb0 data-v-0070d511><!--[--><!--]--><div class="edit-info" data-v-0070d511><div class="edit-link" data-v-0070d511><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/深入Vue3源码，看看Vue.use后究竟发生了什么？.md" target="_blank" rel="noreferrer" data-v-0070d511><!--[--><span class="vpi-square-pen edit-link-icon" data-v-0070d511></span> Edit this page on GitHub<!--]--></a></div><div class="last-updated" data-v-0070d511><p class="VPLastUpdated" data-v-0070d511 data-v-c8f23e1a>Updated Date: <time datetime="2024-06-02T08:25:35.000Z" data-v-c8f23e1a></time></p></div></div><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-0070d511><span class="visually-hidden" id="doc-footer-aria-label" data-v-0070d511>Pager</span><div class="pager" data-v-0070d511><a class="VPLink link pager-link prev" href="/article/%E6%B7%B1%E5%85%A5JavaScript%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B.html" data-v-0070d511><!--[--><span class="desc" data-v-0070d511>Previous page</span><span class="title" data-v-0070d511>深入JavaScript数据类型</span><!--]--></a></div><div class="pager" data-v-0070d511><a class="VPLink link pager-link next" href="/article/%E6%B7%B1%E5%85%A5%E7%90%86%E8%A7%A3Proxy%E4%B8%8EReflect.html" data-v-0070d511><!--[--><span class="desc" data-v-0070d511>Next page</span><span class="title" data-v-0070d511>深入理解Proxy与Reflect</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-21197ea5 data-v-885c3058><div class="container" data-v-885c3058><p class="message" data-v-885c3058>Released under the MIT License.</p><p class="copyright" data-v-885c3058>Copyright © 2022-PRESENT ZiuChen</p></div></footer><!--[--><!--]--></div></div>
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