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+---
+title: function* 表达式
+slug: Web/JavaScript/Reference/Operators/function*
+tags:
+  - ECMAScript 2015
+  - Function
+  - Iterator
+  - JavaScript
+  - Operator
+  - Primary Expression
+translation_of: Web/JavaScript/Reference/Operators/function*
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p><strong><code>function*</code></strong>关键字可以在表达式内部定义一个生成器函数。</p>
+
+<p>{{EmbedInteractiveExample("pages/js/expressions-functionasteriskexpression.html")}}</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">function* [<em>name</em>]([<em>param1</em>[, <em>param2[</em>, ..., <em>paramN</em>]]]) {
+   <em>statements</em>
+}</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>name</code></dt>
+ <dd>函数名。在声明<em>匿名函数</em>时可以省略。函数名称只是函数体中的一个本地变量。</dd>
+ <dt><code>paramN</code></dt>
+ <dd>传入函数的一个参数名。一个函数最多有 255 个参数。</dd>
+ <dt><code>statements</code></dt>
+ <dd>函数体。</dd>
+</dl>
+
+<h2 id="描述">描述</h2>
+
+<p><code>function*</code>表达式和{{jsxref('Statements/function*', 'function* 声明')}}比较相似，并具有几乎相同的语法。<code>function*</code>表达式和<code>function*</code>声明之间主要区别就是函数名，即在创建匿名函数时，<code>function*</code>表达式可以省略函数名。阅读{{jsxref('Function', '函数')}}章节了解更多信息。</p>
+
+<h2 id="示例">示例</h2>
+
+<p>下面的示例定义了一个未命名的生成器函数并把它赋值给<code>x</code>。函数产出它的传入参数的平方：</p>
+
+<pre class="brush: js">var x = function*(y) {
+   yield y * y;
+};
+</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('ES2015', '#', 'function*')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#', 'function*')}}</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.operators.function_star")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Statements/function*", "function* statement")}}</li>
+ <li>{{jsxref("GeneratorFunction")}} 对象</li>
+ <li><a href="/en-US/docs/Web/JavaScript/Guide/The_Iterator_protocol">The Iterator protocol</a></li>
+ <li>{{jsxref("Operators/yield", "yield")}}</li>
+ <li>{{jsxref("Operators/yield*", "yield*")}}</li>
+ <li>{{jsxref("Function")}} 对象</li>
+ <li>{{jsxref("Statements/function", "function statement")}}</li>
+ <li>{{jsxref("Operators/function", "function expression")}}</li>
+ <li>{{jsxref("Functions_and_function_scope", "Functions and function scope")}}</li>
+</ul>