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authorFlorian Merz <me@fiji-flo.de>2021-02-11 12:56:40 +0100
committerFlorian Merz <me@fiji-flo.de>2021-02-11 12:56:40 +0100
commit310fd066e91f454b990372ffa30e803cc8120975 (patch)
treed5d900deb656a5da18e0b60d00f0db73f3a2e88e /files/zh-cn/web/javascript/reference/global_objects/weakmap
parent8260a606c143e6b55a467edf017a56bdcd6cba7e (diff)
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----
-title: WeakMap.prototype
-slug: Web/JavaScript/Reference/Global_Objects/WeakMap/prototype
-translation_of: Web/JavaScript/Reference/Global_Objects/WeakMap
-translation_of_original: Web/JavaScript/Reference/Global_Objects/WeakMap/prototype
----
-<div>{{JSRef}}</div>
-
-<p><code><strong>WeakMap</strong></code><strong><code>.prototype</code></strong>属性表现为 {{jsxref("WeakMap")}}的构造器。</p>
-
-<div>{{js_property_attributes(0,0,0)}}</div>
-
-<h2 id="描述">描述</h2>
-
-<p>{{jsxref("WeakMap")}} 实例从 {{jsxref("WeakMap.prototype")}}继承了所有属性。你可以在<code>WeakMap构造器中添加属性和方法,从而使得所有</code>实例中都有效。</p>
-
-<p><code>WeakMap.prototype</code> 本身只是一个普通的对象:</p>
-
-<pre class="brush: js">Object.prototype.toString.call(WeakMap.prototype); // "[object Object]"</pre>
-
-<h2 id="属性">属性</h2>
-
-<dl>
- <dt><code>WeakMap.prototype.constructor</code></dt>
- <dd>返回创建WeakMap实例的原型函数。 {{jsxref("WeakMap")}}函数是默认的。</dd>
-</dl>
-
-<h2 id="方法">方法</h2>
-
-<dl>
- <dt>{{jsxref("WeakMap.delete", "WeakMap.prototype.delete(key)")}}</dt>
- <dd>移除key的关联对象。执行后 <code>WeakMap.prototype.has(key)返回</code><code>false。</code></dd>
- <dt>{{jsxref("WeakMap.get", "WeakMap.prototype.get(key)")}}</dt>
- <dd>返回<code>key关联对象</code>, 或者 <code>undefined</code>(没有key关联对象时)。</dd>
- <dt>{{jsxref("WeakMap.has", "WeakMap.prototype.has(key)")}}</dt>
- <dd>根据是否有key关联对象返回一个Boolean值。</dd>
- <dt>{{jsxref("WeakMap.set", "WeakMap.prototype.set(key, value)")}}</dt>
- <dd>在WeakMap中设置一组key关联对象,返回这个 <code>WeakMap</code>对象。</dd>
- <dt><s class="obsoleteElement">{{jsxref("WeakMap.prototype.clear()")}} {{obsolete_inline}}</s></dt>
- <dd><s class="obsoleteElement">从<code>WeakMap中移除所有的</code> key/value 。 注意,该方法已弃用,但可以通过创建一个空的WeakMap并替换原对象来实现 (参看 {{jsxref("WeakMap")}}的后半部分)</s></dd>
-</dl>
-
-<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', 'WeakMap.prototype')}}</td>
- <td>{{Spec2('ES6')}}</td>
- <td>Initial definition.</td>
- </tr>
- <tr>
- <td>{{SpecName('ESDraft', '#sec-weakmap.prototype', 'WeakMap.prototype')}}</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>
- <tr>
- <td>Ordinary object</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatGeckoDesktop("40")}}</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatUnknown}}</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>Basic support</td>
- <td>{{CompatNo}}</td>
- <td>{{CompatNo}}</td>
- <td>{{CompatGeckoMobile("6.0")}}</td>
- <td>{{CompatNo}}</td>
- <td>{{CompatNo}}</td>
- <td>8</td>
- </tr>
- <tr>
- <td>Ordinary object</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatGeckoMobile("40")}}</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatUnknown}}</td>
- </tr>
- </tbody>
-</table>
-</div>
-
-<h2 id="另请参阅">另请参阅</h2>
-
-<ul>
- <li>{{jsxref("Map.prototype")}}</li>
-</ul>