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+---
+title: WeakMap.prototype.set()
+slug: Web/JavaScript/Reference/Global_Objects/WeakMap/set
+tags:
+  - JavaScript
+  - Method
+  - WeakMap
+translation_of: Web/JavaScript/Reference/Global_Objects/WeakMap/set
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>set()</strong></code> 方法根据指定的<code>key</code>和<code>value在</code> <code>WeakMap</code>对象中添加新/更新元素。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/weakmap-prototype-set.html")}}</div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><em>wm</em>.set(key, value);</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>key</dt>
+ <dd>必须的。必须是<code>对象</code>。是要在<code>WeakMap</code> 对象中添加元素的key部分。</dd>
+ <dt>value</dt>
+ <dd>必须的。任意的值。是要在<code>WeakMap</code> 对象中添加/元素的value部分。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>该<code>WeakMap</code>对象</p>
+
+<h2 id="例子">例子</h2>
+
+<h3 id="使用set方法"><code>使用set方法</code></h3>
+
+<pre class="brush: js">var wm = new WeakMap();
+var obj = {};
+
+// Add new elements to the WeakMap
+wm.set(obj, "foo").set(window, "bar"); // chainable
+
+// Update an element in the WeakMap
+wm.set(obj, "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('ES6', '#sec-weakmap.prototype.set', 'WeakMap.prototype.set')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-weakmap.prototype.set', 'WeakMap.prototype.set')}}</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.WeakMap.set")}}</p>
+
+<h2 id="Firefox-特殊说明">Firefox-特殊说明</h2>
+
+<ul>
+ <li>直到Firefox 33 {{geckoRelease("33")}}, <code>WeakMap.prototype.set</code> returned <code>undefined</code> 而不支持联式。它已经修复 ({{bug(1031632)}}). 这样的实现也存在于 Chrome/v8 (<a href="https://code.google.com/p/v8/issues/detail?id=3410">issue</a>).</li>
+</ul>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("WeakMap")}}</li>
+ <li>{{jsxref("WeakMap.prototype.get()")}}</li>
+ <li>{{jsxref("WeakMap.prototype.has()")}}</li>
+</ul>