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+---
+title: WeakMap.prototype.has()
+slug: Web/JavaScript/Reference/Global_Objects/WeakMap/has
+translation_of: Web/JavaScript/Reference/Global_Objects/WeakMap/has
+---
+<div>{{JSRef}}</div>
+
+<p> <code><strong>has()</strong></code> 方法根据WeakMap对象的元素中是否存在key键返回一个boolean值。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><code><em>wm</em>.has(key);</code></pre>
+
+<h3 id="Parameters">Parameters</h3>
+
+<dl>
+ <dt>key</dt>
+ <dd>必须的。用来检测WeakMap对象中是否存在元素的键为key。</dd>
+</dl>
+
+<h3 id="Return_value">Return value</h3>
+
+<dl>
+ <dt>Boolean</dt>
+ <dd>如果指定的key存在于某个元素中则返回true，否则返回flase。</dd>
+</dl>
+
+<h2 id="例子">例子</h2>
+
+<h3 id="使用_has方法">使用 <code>has方法</code></h3>
+
+<pre class="brush: js">var wm = new WeakMap();
+wm.set(window, "foo");
+
+wm.has(window); // returns true
+wm.has("baz");  // returns false
+</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-weakmap.prototype.has', 'WeakMap.prototype.has')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-weakmap.prototype.has', 'WeakMap.prototype.has')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容">浏览器兼容</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<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>Basic support</td>
+   <td>36</td>
+   <td>{{CompatGeckoDesktop("6.0")}}</td>
+   <td>11</td>
+   <td>23</td>
+   <td>7.1</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoMobile("6.0")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>8</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="Firefox-特有说明">Firefox-特有说明</h2>
+
+<ul>
+ <li>直到SpiderMonkey 38 {{geckoRelease(38)}}, 这个方法在key参数不是一个对象时会抛出 {{jsxref("TypeError")}}。它已经从版本38后按照最新版本的ES6标准修复 ({{bug(1127827)}}).</li>
+</ul>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("WeakMap")}}</li>
+ <li>{{jsxref("WeakMap.prototype.set()")}}</li>
+ <li>{{jsxref("WeakMap.prototype.get()")}}</li>
+</ul>