study/uTools-Manuals
1
0
Fork 0
mirror of https://github.com/fofolee/uTools-Manuals.git synced 2025-06-11 00:54:06 +08:00
Code Issues Packages Projects Releases Wiki Activity
uTools-Manuals/docs/javascript/Reference/Statements/import.html
fofolee 38dcd51d8a v0.0.2
2019-04-21 11:50:48 +08:00

295 lines
28 KiB
HTML
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

<article id="wikiArticle">
<p></p><p></p>
<p>静态的<code><strong>import</strong></code> 语句用于导入由另一个模块导出的绑定。无论是否声明了 <a href="Reference/Strict_mode" title="如果你想改变你的代码，让其工作在具有限制性JavaScript环境中，请参阅转换成严格模式。"><code>strict mode</code></a> ，导入的模块都运行在严格模式下。在浏览器中，<code>import</code> 语句只能在声明了 <code>type="module"</code> 的 <code>script</code> 的标签中使用。</p>
<p>此外，还有一个类似函数的动态 <code>import()</code>，它不需要依赖 <code>type="module"</code> 的script标签。</p>
<p>在 <a href="/zh-CN/docs/Web/HTML/Element/script">script</a> 标签中使用 <code>nomodule</code> 属性，可以确保向后兼容。</p>
<p>在您希望按照一定的条件或者按需加载模块的时候，动态<code>import()</code> 是非常有用的。而静态型的 <code>import</code> 是初始化加载依赖项的最优选择，使用静态 <code>import</code> 更容易从代码静态分析工具和 <a href="/zh-CN/docs/Glossary/Tree_shaking">tree shaking</a> 中受益。</p>
<p>语法</p>
<pre><code class="language-javascript">import <em>defaultExport</em> from "<em>module-name</em>";
import * as <em>name</em> from "<em>module-name</em>";
import { <em>export </em>} from "<em>module-name</em>";
import { <em>export</em> as <em>alias </em>} from "<em>module-name</em>";
import { <em>export1 , export2</em> } from "<em>module-name</em>";
import { foo , bar } from "module-name/path/to/specific/un-exported/file";
import { <em>export1 , export2</em> as <em>alias2</em> , <em>[...]</em> } from "<em>module-name</em>";
import <em>defaultExport</em>, { <em>export</em> [ , <em>[...]</em> ] } from "<em>module-name</em>";
import <em>defaultExport</em>, * as <em>name</em> from "<em>module-name</em>";
import "<em>module-name</em>";
var promise = import("module-name");//这是一个处于第三阶段的提案。
</code></pre>
<dl>
<dt><code>defaultExport</code></dt>
<dd>导入模块的默认导出接口的引用名。</dd>
<dt><code>module-name</code></dt>
<dd>要导入的模块。通常是包含目标模块的<code>.js</code>文件的相对或绝对路径名，可以不包括<code>.js</code>扩展名。某些特定的打包工具可能允许或需要使用扩展或依赖文件，它会检查比对你的运行环境。只允许单引号和双引号的字符串。</dd>
<dt><code>name</code></dt>
<dd>导入模块对象整体的别名，在引用导入模块时，它将作为一个命名空间来使用。</dd>
<dt><code>export, exportN</code></dt>
<dd>被导入模块的导出接口的名称。</dd>
<dt><code>alias, aliasN</code></dt>
<dd>将引用指定的导入的名称。</dd>
</dl>
<h2 id="描述">描述</h2>
<p><code>name</code>参数是“导入模块对象”的名称，它将用一种名称空间来引用导入模块的接口。export参数指定单个的命名导出，而<code>import * as name</code>语法导入所有导出接口，即导入模块整体。以下示例阐明该语法。</p>
<h3 id="导入整个模块的内容">导入整个模块的内容</h3>
<p>这将<code>myModule</code>插入当前作用域，其中包含来自位于<code>/modules/my-module.js</code>文件中导出的所有接口。</p>
<pre><code class="language-javascript">import * as myModule from '/modules/my-module.js';
</code></pre>
<p>在这里，访问导出接口意味着使用模块名称（在本例为“myModule”）作为命名空间。例如，如果上面导入的模块包含一个接口<code>doAllTheAmazingThings()</code>，你可以这样调用：</p>
<pre><code class="language-javascript">myModule.doAllTheAmazingThings();</code></pre>
<h3 id="导入单个接口">导入单个接口</h3>
<p>给定一个名为<code>myExport</code>的对象或值，它已经从模块<code>my-module</code>导出（因为整个模块被导出）或显式地导出（使用<a href="Reference/Statements/export" title="在创建JavaScript模块时，export 语句用于从模块中导出函数、对象或原始值，以便其他程序可以通过 import 语句使用它们。"><code>export</code></a>语句），将<code>myExport</code>插入当前作用域。</p>
<pre><code class="language-javascript">import {myExport} from '/modules/my-module.js';</code></pre>
<h3 id="导入多个接口">导入多个接口</h3>
<p>这将<code>foo</code>和<code>bar</code>插入当前作用域。</p>
<pre><code class="language-javascript">import {foo, bar} from '/modules/my-module.js';</code></pre>
<h3 id="导入带有别名的接口">导入带有别名的接口</h3>
<p>你可以在导入时重命名接口。例如，将<code>shortName</code>插入当前作用域。</p>
<pre><code class="language-javascript">import {reallyReallyLongModuleExportName as shortName}
from '/modules/my-module.js';</code></pre>
<h3 id="导入时重命名多个接口">导入时重命名多个接口</h3>
<p>使用别名导入模块的多个接口。</p>
<pre><code class="language-javascript">import {
  reallyReallyLongModuleMemberName as shortName,
  anotherLongModuleName as short
} from '/modules/my-module.js';
</code></pre>
<h3 id="仅为副作用而导入一个模块">仅为副作用而导入一个模块</h3>
<p>整个模块仅为副作用（中性词，无贬义含义）而导入，而不导入模块中的任何内容（接口）。 这将运行模块中的全局代码, 但实际上不导入任何值。</p>
<pre><code>import '/modules/my-module.js';</code></code></pre>
<h3 id="导入默认值">导入默认值</h3>
<p><code><font face="Arial, x-locale-body, sans-serif"><span style="background-color: #ffffff;">引入模块可能有一个</span></font>default</code><a href="Reference/Statements/export" title="在创建JavaScript模块时，export 语句用于从模块中导出函数、对象或原始值，以便其他程序可以通过 import 语句使用它们。"><code>export</code></a>（无论它是对象，函数，类等）可用。然后可以使用<code>import</code>语句来导入这样的默认接口。</p>
<p>最简单的用法是直接导入默认值：</p>
<pre><code class="language-javascript">import myDefault from '/modules/my-module.js';</code></pre>
<p>也可以同时将<code>default</code>语法与上述用法（命名空间导入或命名导入）一起使用。在这种情况下，<code>default</code>导入必须首先声明。 例如：</p>
<pre><code class="language-javascript">import myDefault, * as myModule from '/modules/my-module.js';
// myModule used as a namespace</code></pre>
<p>或者</p>
<pre><code class="language-javascript">import myDefault, {foo, bar} from '/modules/my-module.js';
// specific, named imports
</code></pre>
<h3 id="动态import">动态import</h3>
<p>关键字import可以像调用函数一样来动态的导入模块。以这种方式调用，将返回一个 <code>promise</code>。</p>
<p> </p>
<pre><code>import('/modules/my-module.js')
.then((module) =&gt; {
// Do something with the module.
});</code>
</code></pre>
<p>这种使用方式也支持 <code>await</code> 关键字。</p>
<pre><code>let module = await import('/modules/my-module.js');</code></code></pre>
<p> </p>
<p> </p>
<h2 id="示例">示例</h2>
<h3 id="标准导入">标准导入</h3>
<p>下面的代码将会演示如何从辅助模块导入以协助处理AJAX JSON请求。</p>
<h4 id="模块：file.js">模块：file.js</h4>
<pre><code class="language-javascript">function getJSON(url, callback) {
let xhr = new XMLHttpRequest();
xhr.onload = function () {
callback(this.responseText)
};
xhr.open('GET', url, true);
xhr.send();
}
export function getUsefulContents(url, callback) {
getJSON(url, data =&gt; callback(JSON.parse(data)));
}</code></pre>
<h4 id="主程序：main.js">主程序：main.js</h4>
<pre><code class="language-javascript">import { getUsefulContents } from '/modules/file.js';
getUsefulContents('http://www.example.com',
data =&gt; { doSomethingUseful(data); });</code></pre>
<h3 id="动态导入">动态导入</h3>
<p>此示例展示了如何基于用户操作去加载功能模块到页面上，在例子中通过点击按钮，然后会调用模块内的函数。当然这不是能实现这个功能的唯一方式，<code>import()</code>函数也可以支持<code>await</code>。</p>
<pre><code class="language-javascript">const main = document.querySelector("main");
for (const link of document.querySelectorAll("nav &gt; a")) {
link.addEventListener("click", e =&gt; {
e.preventDefault();
import('/modules/my-module.js')
.then(module =&gt; {
module.loadPageInto(main);
})
.catch(err =&gt; {
main.textContent = err.message;
});
});
}</code></pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td><a class="external" href="https://github.com/tc39/proposal-dynamic-import/#import" rel="noopener">"function-like" dynamic <code>import()</code>proposal</a></td>
<td>Stage 3</td>
<td> </td>
</tr>
<tr>
<td><a class="external" href="https://tc39.github.io/ecma262/#sec-imports" hreflang="en" lang="en" rel="noopener">ECMAScript Latest Draft (ECMA-262)<br/><small lang="zh-CN">Imports</small></a></td>
<td><span class="spec-Draft">Draft</span></td>
<td> </td>
</tr>
<tr>
<td><a class="external" href="https://www.ecma-international.org/ecma-262/9.0/#sec-imports" hreflang="en" lang="en" rel="noopener">ECMAScript 2018 (ECMA-262)<br/><small lang="zh-CN">Imports</small></a></td>
<td><span class="spec-Standard">Standard</span></td>
<td> </td>
</tr>
<tr>
<td><a class="external" href="https://www.ecma-international.org/ecma-262/8.0/#sec-imports" hreflang="en" lang="en" rel="noopener">ECMAScript 2017 (ECMA-262)<br/><small lang="zh-CN">Imports</small></a></td>
<td><span class="spec-Standard">Standard</span></td>
<td> </td>
</tr>
<tr>
<td><a class="external" href="https://www.ecma-international.org/ecma-262/7.0/#sec-imports" hreflang="en" lang="en" rel="noopener">ECMAScript 2016 (ECMA-262)<br/><small lang="zh-CN">Imports</small></a></td>
<td><span class="spec-Standard">Standard</span></td>
<td> </td>
</tr>
<tr>
<td><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#sec-imports" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">Imports</small></a></td>
<td><span class="spec-Standard">Standard</span></td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<div class="hidden">The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out <a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</div>
<p></p><div class="bc-data"><a class="bc-github-link external" href="https://github.com/mdn/browser-compat-data" rel="noopener">Update compatibility data on GitHub</a><table class="bc-table bc-table-js"><thead><tr class="bc-platforms"><td></td><th class="bc-platform-desktop" colspan="6"><span>Desktop</span></th><th class="bc-platform-mobile" colspan="7"><span>Mobile</span></th><th class="bc-platform-server" colspan="1"><span>Server</span></th></tr><tr class="bc-browsers"><td></td><th class="bc-browser-chrome"><span class="bc-head-txt-label bc-head-icon-chrome">Chrome</span></th><th class="bc-browser-edge"><span class="bc-head-txt-label bc-head-icon-edge">Edge</span></th><th class="bc-browser-firefox"><span class="bc-head-txt-label bc-head-icon-firefox">Firefox</span></th><th class="bc-browser-ie"><span class="bc-head-txt-label bc-head-icon-ie">Internet Explorer</span></th><th class="bc-browser-opera"><span class="bc-head-txt-label bc-head-icon-opera">Opera</span></th><th class="bc-browser-safari"><span class="bc-head-txt-label bc-head-icon-safari">Safari</span></th><th class="bc-browser-webview_android"><span class="bc-head-txt-label bc-head-icon-webview_android">Android webview</span></th><th class="bc-browser-chrome_android"><span class="bc-head-txt-label bc-head-icon-chrome_android">Chrome for Android</span></th><th class="bc-browser-edge_mobile"><span class="bc-head-txt-label bc-head-icon-edge_mobile">Edge Mobile</span></th><th class="bc-browser-firefox_android"><span class="bc-head-txt-label bc-head-icon-firefox_android">Firefox for Android</span></th><th class="bc-browser-opera_android"><span class="bc-head-txt-label bc-head-icon-opera_android">Opera for Android</span></th><th class="bc-browser-safari_ios"><span class="bc-head-txt-label bc-head-icon-safari_ios">Safari on iOS</span></th><th class="bc-browser-samsunginternet_android"><span class="bc-head-txt-label bc-head-icon-samsunginternet_android">Samsung Internet</span></th><th class="bc-browser-nodejs"><span class="bc-head-txt-label bc-head-icon-nodejs">Node.js</span></th></tr></thead><tbody><tr><th scope="row"><code>import</code></th><td class="bc-supports-yes bc-browser-chrome"><span class="bc-browser-name">Chrome</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
61</td><td class="bc-supports-yes bc-browser-edge bc-has-history"><span class="bc-browser-name">Edge</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
16<div class="bc-icons"></div><section class="bc-history" id="sect1"><dl><dt class="bc-supports-yes bc-supports"><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
16<div class="bc-icons"></div></dt><dd></dd><dt class="bc-supports-yes bc-supports"><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
15<div class="bc-icons"><abbr class="only-icon" title="User must explicitly enable this feature."><span>Disabled</span><i class="ic-disabled"></i></abbr> </div></dt><dd><abbr class="only-icon" title="User must explicitly enable this feature."><span>Disabled</span><i class="ic-disabled"></i></abbr> From version 15: this feature is behind the <code>Experimental JavaScript Features</code> preference.</dd></dl></section></td><td class="bc-supports-yes bc-browser-firefox bc-has-history"><span class="bc-browser-name">Firefox</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
60<div class="bc-icons"></div><section class="bc-history" id="sect2"><dl><dt class="bc-supports-yes bc-supports"><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
60<div class="bc-icons"></div></dt><dd></dd><dt class="bc-supports-no bc-supports"><abbr class="bc-level-no only-icon" title="No support">
<span>No support</span>
</abbr>54 — 60<div class="bc-icons"><abbr class="only-icon" title="User must explicitly enable this feature."><span>Disabled</span><i class="ic-disabled"></i></abbr> </div></dt><dd><abbr class="only-icon" title="User must explicitly enable this feature."><span>Disabled</span><i class="ic-disabled"></i></abbr> From version 54 until version 60 (exclusive): this feature is behind the <code>dom.moduleScripts.enabled</code> preference. To change preferences in Firefox, visit about:config.</dd></dl></section></td><td class="bc-supports-no bc-browser-ie"><span class="bc-browser-name">IE</span><abbr class="bc-level-no only-icon" title="No support">
<span>No support</span>
</abbr>
No</td><td class="bc-supports-yes bc-browser-opera"><span class="bc-browser-name">Opera</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
47</td><td class="bc-supports-yes bc-browser-safari"><span class="bc-browser-name">Safari</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
10.1</td><td class="bc-supports-yes bc-browser-webview_android"><span class="bc-browser-name">WebView Android</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
61</td><td class="bc-supports-yes bc-browser-chrome_android"><span class="bc-browser-name">Chrome Android</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
61</td><td class="bc-supports-yes bc-browser-edge_mobile"><span class="bc-browser-name">Edge Mobile</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
Yes</td><td class="bc-supports-yes bc-browser-firefox_android bc-has-history"><span class="bc-browser-name">Firefox Android</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
60<div class="bc-icons"></div><section class="bc-history" id="sect3"><dl><dt class="bc-supports-yes bc-supports"><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
60<div class="bc-icons"></div></dt><dd></dd><dt class="bc-supports-no bc-supports"><abbr class="bc-level-no only-icon" title="No support">
<span>No support</span>
</abbr>54 — 60<div class="bc-icons"><abbr class="only-icon" title="User must explicitly enable this feature."><span>Disabled</span><i class="ic-disabled"></i></abbr> </div></dt><dd><abbr class="only-icon" title="User must explicitly enable this feature."><span>Disabled</span><i class="ic-disabled"></i></abbr> From version 54 until version 60 (exclusive): this feature is behind the <code>dom.moduleScripts.enabled</code> preference. To change preferences in Firefox, visit about:config.</dd></dl></section></td><td class="bc-supports-yes bc-browser-opera_android"><span class="bc-browser-name">Opera Android</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
47</td><td class="bc-supports-yes bc-browser-safari_ios"><span class="bc-browser-name">Safari iOS</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
10.1</td><td class="bc-supports-no bc-browser-samsunginternet_android"><span class="bc-browser-name">Samsung Internet Android</span><abbr class="bc-level-no only-icon" title="No support">
<span>No support</span>
</abbr>
No</td><td class="bc-supports-yes bc-browser-nodejs bc-has-history"><span class="bc-browser-name">nodejs</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
8.5.0<div class="bc-icons"><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> <abbr class="only-icon" title="User must explicitly enable this feature."><span>Disabled</span><i class="ic-disabled"></i></abbr> </div><section class="bc-history" id="sect4"><dl><dt class="bc-supports-yes bc-supports"><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
8.5.0<div class="bc-icons"><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> <abbr class="only-icon" title="User must explicitly enable this feature."><span>Disabled</span><i class="ic-disabled"></i></abbr> </div></dt><dd><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> files must have suffix .mjs, not .js</dd><dd><abbr class="only-icon" title="User must explicitly enable this feature."><span>Disabled</span><i class="ic-disabled"></i></abbr> From version 8.5.0: this feature is behind the <code>--experimental-modules</code> runtime flag.</dd></dl></section></td></tr><tr><th scope="row">Dynamic import</th><td class="bc-supports-yes bc-browser-chrome"><span class="bc-browser-name">Chrome</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
63</td><td class="bc-supports-no bc-browser-edge bc-has-history"><span class="bc-browser-name">Edge</span><abbr class="bc-level-no only-icon" title="No support">
<span>No support</span>
</abbr>
No<div class="bc-icons"><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> </div><section class="bc-history" id="sect5"><dl><dt class="bc-supports-no bc-supports"><abbr class="bc-level-no only-icon" title="No support">
<span>No support</span>
</abbr>
No<div class="bc-icons"><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> </div></dt><dd><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> See <a class="external" href="https://developer.microsoft.com/en-us/microsoft-edge/platform/status/javascriptmoduleimport/" rel="noopener">development status</a>.</dd></dl></section></td><td class="bc-supports-yes bc-browser-firefox bc-has-history"><span class="bc-browser-name">Firefox</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
66<div class="bc-icons"><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> <abbr class="only-icon" title="User must explicitly enable this feature."><span>Disabled</span><i class="ic-disabled"></i></abbr> </div><section class="bc-history" id="sect6"><dl><dt class="bc-supports-yes bc-supports"><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
66<div class="bc-icons"><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> <abbr class="only-icon" title="User must explicitly enable this feature."><span>Disabled</span><i class="ic-disabled"></i></abbr> </div></dt><dd><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> See <a class="external" href="https://bugzil.la/1517546" rel="noopener">bug 1517546</a>. This flag is enabled by default on nightly builds from Nightly 67. See <a class="external" href="https://bugzil.la/1522491" rel="noopener">bug 1522491</a>.</dd><dd><abbr class="only-icon" title="User must explicitly enable this feature."><span>Disabled</span><i class="ic-disabled"></i></abbr> From version 66: this feature is behind the <code>javascript.options.dynamicImport</code> preference (needs to be set to <code>true</code>). To change preferences in Firefox, visit about:config.</dd></dl></section></td><td class="bc-supports-no bc-browser-ie"><span class="bc-browser-name">IE</span><abbr class="bc-level-no only-icon" title="No support">
<span>No support</span>
</abbr>
No</td><td class="bc-supports-yes bc-browser-opera"><span class="bc-browser-name">Opera</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
50</td><td class="bc-supports-yes bc-browser-safari"><span class="bc-browser-name">Safari</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
11.1</td><td class="bc-supports-yes bc-browser-webview_android"><span class="bc-browser-name">WebView Android</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
63</td><td class="bc-supports-yes bc-browser-chrome_android"><span class="bc-browser-name">Chrome Android</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
63</td><td class="bc-supports-no bc-browser-edge_mobile"><span class="bc-browser-name">Edge Mobile</span><abbr class="bc-level-no only-icon" title="No support">
<span>No support</span>
</abbr>
No</td><td class="bc-supports-yes bc-browser-firefox_android bc-has-history"><span class="bc-browser-name">Firefox Android</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
66<div class="bc-icons"><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> <abbr class="only-icon" title="User must explicitly enable this feature."><span>Disabled</span><i class="ic-disabled"></i></abbr> </div><section class="bc-history" id="sect7"><dl><dt class="bc-supports-yes bc-supports"><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
66<div class="bc-icons"><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> <abbr class="only-icon" title="User must explicitly enable this feature."><span>Disabled</span><i class="ic-disabled"></i></abbr> </div></dt><dd><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> See <a class="external" href="https://bugzil.la/1517546" rel="noopener">bug 1517546</a>. This flag is enabled by default on nightly builds from Nightly 67. See <a class="external" href="https://bugzil.la/1522491" rel="noopener">bug 1522491</a>.</dd><dd><abbr class="only-icon" title="User must explicitly enable this feature."><span>Disabled</span><i class="ic-disabled"></i></abbr> From version 66: this feature is behind the <code>javascript.options.dynamicImport</code> preference (needs to be set to <code>true</code>). To change preferences in Firefox, visit about:config.</dd></dl></section></td><td class="bc-supports-yes bc-browser-opera_android"><span class="bc-browser-name">Opera Android</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
50</td><td class="bc-supports-yes bc-browser-safari_ios"><span class="bc-browser-name">Safari iOS</span><abbr class="bc-level-yes only-icon" title="Full support">
<span>Full support</span>
</abbr>
11.1</td><td class="bc-supports-no bc-browser-samsunginternet_android"><span class="bc-browser-name">Samsung Internet Android</span><abbr class="bc-level-no only-icon" title="No support">
<span>No support</span>
</abbr>
No</td><td class="bc-supports-unknown bc-browser-nodejs"><span class="bc-browser-name">nodejs</span><abbr title="Compatibility unknown; please update this.">
?
</abbr></td></tr></tbody></table><section class="bc-legend" id="sect8"><h3 class="offscreen" id="Legend">Legend</h3><dl><dt><span class="bc-supports-yes bc-supports">
<abbr class="bc-level bc-level-yes only-icon" title="Full support">
<span>Full support</span>
 
</abbr></span></dt><dd>Full support</dd><dt><span class="bc-supports-no bc-supports">
<abbr class="bc-level bc-level-no only-icon" title="No support">
<span>No support</span>
 
</abbr></span></dt><dd>No support</dd><dt><span class="bc-supports-unknown bc-supports">
<abbr class="bc-level bc-level-unknown only-icon" title="Compatibility unknown">
<span>Compatibility unknown</span>
 
</abbr></span></dt><dd>Compatibility unknown</dd><dt><abbr class="only-icon" title="See implementation notes."><span>See implementation notes.</span><i class="ic-footnote"></i></abbr></dt><dd>See implementation notes.</dd><dt><abbr class="only-icon" title="User must explicitly enable this feature."><span>User must explicitly enable this feature.</span><i class="ic-disabled"></i></abbr></dt><dd>User must explicitly enable this feature.</dd></dl></section></div><p></p>
<h2 id="相关链接">相关链接</h2>
<ul>
<li><a href="Reference/Statements/export" title="在创建JavaScript模块时，export 语句用于从模块中导出函数、对象或原始值，以便其他程序可以通过 import 语句使用它们。"><code>export</code></a></li>
<li><a href="/en-US/docs/Web/JavaScript/Reference/Statements/import.meta"><code>import.meta</code></a></li>
<li><a class="external" href="https://blogs.windows.com/msedgedev/2016/05/17/es6-modules-and-beyond/" rel="noopener">Previewing ES6 Modules and more from ES2015, ES2016 and beyond</a></li>
<li><a class="external" href="https://hacks.mozilla.org/2015/08/es6-in-depth-modules/" rel="noopener">ES6 in Depth: Modules</a>, Hacks blog post by Jason Orendorff</li>
<li><a class="external" href="https://hacks.mozilla.org/2018/03/es-modules-a-cartoon-deep-dive/" rel="noopener">ES modules: A cartoon deep-dive</a>, Hacks blog post by Lin Clark</li>
<li><a class="external" href="http://exploringjs.com/es6/ch_modules.html" rel="noopener">Axel Rauschmayer's book: "Exploring JS: Modules"</a></li>
</ul>
</article>
Reference in New Issue View Git Blame Copy Permalink