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: 'Array.prototype[@@iterator]()'
+slug: Web/JavaScript/Reference/Global_Objects/Array/@@iterator
+tags:
+  - Array
+  - ECMAScript 2015
+  - Iterator
+  - JavaScript
+  - Method
+  - Prototype
+  - 原型
+  - 参考
+  - 循环
+  - 方法
+  - 迭代
+translation_of: Web/JavaScript/Reference/Global_Objects/Array/@@iterator
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>@@iterator</strong></code> 属性和 {{jsxref("Array.prototype.values()", "Array.prototype.values()")}} 属性的初始值是同一个函数对象。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js"><var>arr</var>[Symbol.iterator]()</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>数组的 <strong>iterator </strong>方法，默认情况下，与 {{jsxref("Array.prototype.values()", "values()")}} 返回值相同， <code>arr[Symbol.iterator]</code> 则会返回 {{jsxref("Array.prototype.values()", "values()")}} 函数。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_for...of_循环进行迭代"><font face="Open Sans, Arial, sans-serif">使用 </font><code>for...of</code> 循环进行迭代</h3>
+
+<pre class="brush: js">var arr = ['a', 'b', 'c', 'd', 'e'];
+var eArr = arr[Symbol.iterator]();
+// 浏览器必须支持 for...of 循环
+for (let letter of eArr) {
+  console.log(letter);
+}
+</pre>
+
+<h3 id="另一种迭代方式">另一种迭代方式</h3>
+
+<pre class="brush: js">var arr = ['a', 'b', 'c', 'd', 'e'];
+var eArr = arr[Symbol.iterator]();
+console.log(eArr.next().value); // a
+console.log(eArr.next().value); // b
+console.log(eArr.next().value); // c
+console.log(eArr.next().value); // d
+console.log(eArr.next().value); // e
+</pre>
+
+<h3 id="Use_Case_for_brace_notation">Use Case for brace notation</h3>
+
+<p>The use case for this syntax over using the dot notation (<code>Array.prototype.values()</code>) is in a case where you don't know what object is going to be ahead of time. If you have a function that takes an iterator and then iterate over the value, but don't know if that Object is going to have a [Iterable].prototype.values method. This could be a built-in object like <a href="/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/String/@@iterator">String</a> object or a custom object.</p>
+
+<pre class="brush: js">function logIterable(it) {
+  var iterator = it[Symbol.iterator]();
+  // 浏览器必须支持 for...of 循环
+  for (let letter of iterator) {
+      console.log(letter);
+  }
+}
+
+// Array
+logIterable(['a', 'b', 'c']);
+// a
+// b
+// c
+
+// string
+logIterable('abc');
+// a
+// b
+// c</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范名称</th>
+   <th scope="col">规范状态</th>
+   <th scope="col">备注</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-array.prototype-@@iterator', 'Array.prototype[@@iterator]()')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>首次定义</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-array.prototype-@@iterator', 'Array.prototype[@@iterator]()')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.builtins.Array.@@iterator")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{jsxref("Array.prototype.keys()")}}</li>
+ <li>{{jsxref("Array.prototype.entries()")}}</li>
+ <li>{{jsxref("Array.prototype.forEach()")}}</li>
+ <li>{{jsxref("Array.prototype.every()")}}</li>
+ <li>{{jsxref("Array.prototype.some()")}}</li>
+ <li>{{jsxref("Array.prototype.values()")}}</li>
+</ul>
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