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+---
+title: 'String.prototype[@@iterator]()'
+slug: Web/JavaScript/Reference/Global_Objects/String/@@iterator
+translation_of: Web/JavaScript/Reference/Global_Objects/String/@@iterator
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>[@@iterator]()</code></strong> 方法返回一个新的Iterator对象，它遍历字符串的代码点，返回每一个代码点的字符串值。</p>
+
+<p>{{EmbedInteractiveExample("pages/js/string-iterator.html")}}</p>
+
+<p>The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone <a href="https://github.com/mdn/interactive-examples">https://github.com/mdn/interactive-examples</a> and send us a pull request.</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><code><var>string</var>[Symbol.iterator]</code></pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个新的Iterator对象。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用iterator"><code>使用[@@iterator]()</code></h3>
+
+<pre class="brush:js">var string = 'A\uD835\uDC68';
+
+var strIter = string[Symbol.iterator]();
+
+console.log(strIter.next().value); // "A"
+console.log(strIter.next().value); // "\uD835\uDC68"
+</pre>
+
+<h3 id="通过_for..of_使用iterator"><code>通过</code> <code>for..of 使用[@@iterator]()</code></h3>
+
+<pre class="brush:js">var string = 'A\uD835\uDC68B\uD835\uDC69C\uD835\uDC6A';
+
+for (var v of string) {
+  console.log(v);
+}
+// "A"
+// "\uD835\uDC68"
+// "B"
+// "\uD835\uDC69"
+// "C"
+// "\uD835\uDC6A"
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table>
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES2015', '#sec-string.prototype-@@iterator', 'String.prototype[@@iterator]()')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-string.prototype-@@iterator', 'String.prototype[@@iterator]()')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>基本支持</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop("36")}} [1]</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>基本支持</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoMobile("36")}} [1]</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] From Gecko 17 (Firefox 17 / Thunderbird 17 / SeaMonkey 2.14) to Gecko 26 (Firefox 26 / Thunderbird 26 / SeaMonkey 2.23 / Firefox OS 1.2) the <code>iterator</code> property was used (<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=907077">bug 907077</a>), and from Gecko 27 to Gecko 35 the <code>"@@iterator"</code> placeholder was used. In Gecko 36 (Firefox 36 / Thunderbird 36 / SeaMonkey 2.33), the <code>@@iterator</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol">symbol</a> got implemented (<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=918828">bug 918828</a>).</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Iteration_protocols">Iteration protocols</a></li>
+</ul>