From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: default
+slug: Web/JavaScript/Reference/Statements/default
+tags:
+  - JavaScript
+  - Keyword
+translation_of: Web/JavaScript/Reference/Statements/switch
+---
+<div>{{jsSidebar("Statements")}}</div>
+
+<div></div>
+
+<p><strong>default 关键字</strong>可以在 JavaScript 的两种情况下使用：在 {{jsxref("Statements/switch", "switch")}} ，或 {{jsxref("Statements/export", "export")}} 中。</p>
+
+<h2 id="语法">语法</h2>
+
+<p>在{{jsxref("Statements/switch", "switch")}} 语句中使用:</p>
+
+<pre class="syntaxbox">switch (expression) {
+  case value1:
+    //当表达式的值和value1匹配执行这里的语句
+    [break;]
+  default:
+    //当表达式的值没有匹配，执行这里的语句
+    [break;]
+}</pre>
+
+<p>在{{jsxref("Statements/export", "export")}} 中使用：</p>
+
+<pre class="syntaxbox">export default <em>nameN</em> </pre>
+
+<h2 id="描述">描述</h2>
+
+<p>更多细节，参见</p>
+
+<ul>
+ <li>{{jsxref("Statements/switch", "switch")}} 语句和</li>
+ <li>{{jsxref("Statements/export", "export")}} 语句页面。</li>
+</ul>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="在switch语句中使用default">在<code>switch</code>语句中使用<code>default</code></h3>
+
+<p>在以下示例中，如果<code>expr</code>为“Oranges”或“Apples”，程序将匹配“Oranges”或“Apples”的值并执行相应的声明。在任何其它情况下，<code>default</code>关键字将执行关联的语句。</p>
+
+<pre class="brush: js">switch (expr) {
+  case "Oranges":
+    console.log("Oranges are $0.59 a pound.");
+    break;
+  case "Apples":
+    console.log("Apples are $0.32 a pound.");
+    break;
+  default:
+    console.log("Sorry, we are out of " + expr + ".");
+}</pre>
+
+<h3 id="在export语句中使用default">在<code>export</code>语句中使用<code>default</code></h3>
+
+<p>如果要导出单个值或需要模块的回调值，则可以使用默认导出： </p>
+
+<pre class="brush: js">// module "my-module.js"
+let cube = function cube(x) {
+  return x * x * x;
+}
+export default cube;
+</pre>
+
+<p>然后，在另一个脚本中，默认导出将直接被导入：</p>
+
+<pre class="brush: js">// module "my-module.js"
+import myFunction from 'my-module';
+console.log(myFunction(3)); // 27
+</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>{{SpecName('ES6', '#sec-switch-statement', 'switch statement')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-exports', 'Exports')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-switch-statement', 'switch statement')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-exports', 'Exports')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容">浏览器兼容</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 href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</div>
+
+<p>{{Compat("javascript.statements.default")}}</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("Statements/export", "export")}}</li>
+ <li>{{jsxref("Statements/switch", "switch")}}</li>
+</ul>
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