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authorPeter Bengtsson <mail@peterbe.com>2021-07-16 16:27:00 -0400
committerGitHub <noreply@github.com>2021-07-17 04:27:00 +0800
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delete conflicting/orphaned docs (zh-CN) (#1412)
* delete conflicting docs (zh-CN) * and redirects * do orphaned as well * fix * remove more orphans * revert orphaned docs that can identify origin * move orphaned docs to current loc * adjust slug path * fix redirect change from rebase Co-authored-by: Irvin <irvinfly@gmail.com>
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+---
+title: Map.prototype[@@iterator]()
+slug: Web/JavaScript/Reference/Global_Objects/Map/@@iterator
+translation_of: Web/JavaScript/Reference/Global_Objects/Map/@@iterator
+tags:
+ - ECMAScript 2015
+ - Iterator
+ - JavaScript
+ - Map
+ - Method
+ - Prototype
+ - Reference
+browser-compat: javascript.builtins.Map.@@iterator
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>@@iterator</strong></code><strong> </strong>属性的初始值与 {{jsxref("Map.prototype.entries()", "entries")}} 属性的初始值是同一个函数对象。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/map-prototype-@@iterator.html")}}</div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><code><em>myMap</em>[Symbol.iterator]</code></pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>map 的 <strong>iterator</strong> 函数默认就是 {{jsxref("Map.prototype.entries()", "entries()")}} 函数。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_iterator()">使用 <code>[@@iterator]()</code></h3>
+
+<pre class="brush:js">var myMap = new Map();
+myMap.set('0', 'foo');
+myMap.set(1, 'bar');
+myMap.set({}, 'baz');
+
+var mapIter = myMap[Symbol.iterator]();
+//返回的其实是个generator
+console.log(mapIter.next().value); // ["0", "foo"]
+console.log(mapIter.next().value); // [1, "bar"]
+console.log(mapIter.next().value); // [Object, "baz"]
+</pre>
+
+<h3 id="在for..of中使用iterator()">在<code>for..of中</code>使用<code>[@@iterator]()</code> </h3>
+
+<pre class="brush:js">var myMap = new Map();
+myMap.set('0', 'foo');
+myMap.set(1, 'bar');
+myMap.set({}, 'baz');
+
+for (const entry of myMap) {
+ console.log(entry);
+}
+// ["0", "foo"]
+// [1, "bar"]
+// [{}, "baz"]
+
+for (var v of myMap) {
+ console.log(v);
+}
+
+// 0: foo
+// 1: bar
+// [Object]: baz</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', '#sec-map.prototype-@@iterator', 'Map.prototype[@@iterator]()')}}</td>
+ <td>{{Spec2('ES2015')}}</td>
+ <td>Initial definition.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-map.prototype-@@iterator', 'Map.prototype[@@iterator]()')}}</td>
+ <td>{{Spec2('ESDraft')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容">浏览器兼容</h2>
+
+
+
+<p>{{Compat("javascript.builtins.Map.@@iterator")}}</p>
+
+<h2 id="另见">另见</h2>
+
+<ul>
+ <li>{{jsxref("Map.prototype.entries()")}}</li>
+ <li>{{jsxref("Map.prototype.keys()")}}</li>
+ <li>{{jsxref("Map.prototype.values()")}}</li>
+</ul>