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Diffstat (limited to 'files/zh-cn/web/javascript/reference/global_objects/weakmap/clear')
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diff --git a/files/zh-cn/web/javascript/reference/global_objects/weakmap/clear/index.html b/files/zh-cn/web/javascript/reference/global_objects/weakmap/clear/index.html new file mode 100644 index 0000000000..b2d51c64a1 --- /dev/null +++ b/files/zh-cn/web/javascript/reference/global_objects/weakmap/clear/index.html @@ -0,0 +1,104 @@ +--- +title: WeakMap.prototype.clear() +slug: Web/JavaScript/Reference/Global_Objects/WeakMap/clear +tags: + - JavaScript + - Method + - WeakMap + - clear() +translation_of: Web/JavaScript/Reference/Global_Objects/WeakMap/clear +--- +<div>{{JSRef}} {{obsolete_header}}</div> + +<p><code><strong>clear()</strong></code>用来从 <code>WeakMap对象中移除所有元素。</code>但不再是ECMAScript和它的实现部分。</p> + +<div class="warning"> +<p>Warning:</p> + +<p><img alt="WeakMap(no clear() any more).png" src="https://mdn.mozillademos.org/files/15608/WeakMap(no%20clear()%20any%20more).png" style="height: 490px; width: 735px;"></p> +</div> + +<h2 id="语法">语法</h2> + +<pre class="syntaxbox"><em>wm</em>.clear();</pre> + +<h2 id="示例">示例</h2> + +<h3 id="使用_clear_方法">使用 <code>clear</code> 方法</h3> + +<pre class="brush: js;highlight:[10] example-bad">var wm = new WeakMap(); +var obj = {}; + +wm.set(obj, "foo"); +wm.set(window, "bar"); + +wm.has(obj); // true +wm.has(window); // true + +wm.clear(); + +wm.has(obj) // false +wm.has(window) // false +</pre> + +<h2 id="规范">规范</h2> + +<p>当前版本或者起草中没有这个方法,这个方法在版本 28(2014 年 10 月 14) 之前是 ECMAScript 6 起草规范的一部分,但是在起草之后的版本中被移除了。它不在是最终标准的一部分了 。</p> + +<h2 id="浏览器兼容性">浏览器兼容性</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>{{CompatNo}} [1]</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>{{CompatNo}} [1]</td> + <td>{{CompatNo}}</td> + <td>{{CompatNo}}</td> + <td>8</td> + </tr> + </tbody> +</table> +</div> + +<p>[1] The <code>clear()</code> 曾经在高于 20 版本低于 45 版本之间被支持。</p> + +<h2 id="相近">相近</h2> + +<ul> + <li>{{jsxref("WeakMap")}}</li> +</ul> |