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diff --git a/files/zh-cn/web/javascript/reference/global_objects/weakset/add/index.html b/files/zh-cn/web/javascript/reference/global_objects/weakset/add/index.html
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@@ -0,0 +1,121 @@
+---
+title: WeakSet.prototype.add()
+slug: Web/JavaScript/Reference/Global_Objects/WeakSet/add
+tags:
+  - ECMAScript 2015
+  - JavaScript
+  - WeakSet
+translation_of: Web/JavaScript/Reference/Global_Objects/WeakSet/add
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>add()</strong></code> 方法在 <code>WeakSet</code> 对象的最后一个元素后添加新的对象。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><code><em>ws</em>.add(value);</code>
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>value</dt>
+ <dd>必须。 将对象添加进 <code>WeakSet</code> 集合中。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p><code>WeakSet</code> 对象。</p>
+
+<h2 id="使用_add_方法">使用 <code>add</code> 方法</h2>
+
+<pre class="brush: js">var ws = new WeakSet();
+
+ws.add(window); // 添加 window 对象进 WeakSet 中
+
+ws.has(window); // true
+
+// Weakset 仅取得对象作为参数
+ws.add(1);
+// 结果为 "TypeError: Invalid value used in weak set" 在 Chrome 浏览器中
+// 并且 "TypeError: 1 is not a non-null object" 在 Firefox 浏览器中</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-weakset.prototype.add', 'WeakSet.prototype.add')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-weakset.prototype.add', 'WeakSet.prototype.add')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<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>{{CompatGeckoDesktop(34)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>23</td>
+   <td>{{CompatNo}}</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(34) }}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("WeakSet")}}</li>
+ <li>{{jsxref("WeakSet.prototype.delete()")}}</li>
+ <li>{{jsxref("WeakSet.prototype.has()")}}</li>
+</ul>
diff --git a/files/zh-cn/web/javascript/reference/global_objects/weakset/clear/index.html b/files/zh-cn/web/javascript/reference/global_objects/weakset/clear/index.html
new file mode 100644
index 0000000000..7d1e17ee9d
--- /dev/null
+++ b/files/zh-cn/web/javascript/reference/global_objects/weakset/clear/index.html
@@ -0,0 +1,94 @@
+---
+title: WeakSet.prototype.clear()
+slug: Web/JavaScript/Reference/Global_Objects/WeakSet/clear
+tags:
+  - JavaScript
+  - Method
+  - WeakSet
+  - 废弃
+translation_of: Web/JavaScript/Reference/Global_Objects/WeakSet/clear
+---
+<div>{{JSRef}} {{obsolete_header}}</div>
+
+<p><code><strong>clear()</strong></code> 方法用于删除 <code>WeakSet</code> 对象的所有元素，但是已经不是 ECMAScript 的一部分了。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><em>ws</em>.clear();</pre>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_clear方法">使用 <code>clear方法</code></h3>
+
+<pre class="brush: js example-bad">var ws = new WeakSet();
+
+ws.add(window);
+ws.has(window);  // true
+
+ws.clear();
+
+ws.has(window); // false
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<p>没有规范或草案。该方法原本计划包括在 ECMAScript 6，但是在草案 revision 28 (October 14, 2014) 被抛弃了。浏览器原先的实现不久后也被移除了，它从来不是标准的一分子。</p>
+
+<h2 id="浏览器支持">浏览器支持</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>{{CompatNo}}</td>
+   <td>23</td>
+   <td>{{CompatNo}}</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>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] Added to Firefox in version 34, but removed in version 46. See {{bug(1101817)}}.</p>
+
+<h2 id="相关">相关</h2>
+
+<ul>
+ <li>{{jsxref("WeakSet")}}</li>
+ <li>{{jsxref("WeakSet.prototype.delete()")}}</li>
+</ul>
diff --git a/files/zh-cn/web/javascript/reference/global_objects/weakset/delete/index.html b/files/zh-cn/web/javascript/reference/global_objects/weakset/delete/index.html
new file mode 100644
index 0000000000..82b35b0a7d
--- /dev/null
+++ b/files/zh-cn/web/javascript/reference/global_objects/weakset/delete/index.html
@@ -0,0 +1,117 @@
+---
+title: WeakSet.prototype.delete()
+slug: Web/JavaScript/Reference/Global_Objects/WeakSet/delete
+translation_of: Web/JavaScript/Reference/Global_Objects/WeakSet/delete
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>delete()</strong></code> 方法从 <code>WeakSet 对象中</code>移除指定的元素。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><code><em>ws</em>.delete(value);</code></pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>value</dt>
+ <dd>必须。从 <code>WeakSet</code> 对象中移除的对象。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>如果在 <code>WeakSet</code> 对象中成功移除元素则返回 true。如果 key 没有在 WeakSet 中<font face="Consolas, Liberation Mono, Courier, monospace">找到或者 key 不是一个对象，则返回 false。</font></p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_delete_方法">使用 <code>delete</code> 方法</h3>
+
+<pre class="brush: js">var ws = new WeakSet();
+var obj = {};
+
+ws.add(window);
+
+ws.delete(obj);    // 返回 false。因为找不到要删除的obj
+ws.delete(window); // 返回 true。成功地移除了元素
+
+ws.has(window);    // 返回 false。因为 WeakSet 中已经不存在 window 对象
+</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-weakset.prototype.delete', 'WeakSet.prototype.delete')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-weakset.prototype.delete', 'WeakSet.prototype.delete')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<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>{{CompatGeckoDesktop(34)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>23</td>
+   <td>{{CompatNo}}</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(34) }}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("WeakSet")}}</li>
+ <li>{{jsxref("WeakSet.prototype.clear()")}}</li>
+</ul>
diff --git a/files/zh-cn/web/javascript/reference/global_objects/weakset/has/index.html b/files/zh-cn/web/javascript/reference/global_objects/weakset/has/index.html
new file mode 100644
index 0000000000..7a06b243e3
--- /dev/null
+++ b/files/zh-cn/web/javascript/reference/global_objects/weakset/has/index.html
@@ -0,0 +1,118 @@
+---
+title: WeakSet.prototype.has()
+slug: Web/JavaScript/Reference/Global_Objects/WeakSet/has
+translation_of: Web/JavaScript/Reference/Global_Objects/WeakSet/has
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>has()</strong></code> 方法根据 <code>WeakSet</code> 是否存在相应对象返回布尔值。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><code><em>ws</em>.has(value);</code></pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>value</dt>
+ <dd>必须。 测试 <code>WeakSet 中是否存在该对象。</code></dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<dl>
+ <dt>Boolean</dt>
+ <dd>如果 <code>WeakSet</code> 对象中存在指定的元素，返回 true；否则返回 <code>false。</code></dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_has_方法">使用 <code>has</code> 方法</h3>
+
+<pre class="brush: js">var ws = new WeakSet();
+var obj = {};
+ws.add(window);
+
+mySet.has(window);  // 返回 true
+mySet.has(obj);     // 返回 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-weakset.prototype.has', 'WeakSet.prototype.has')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-weakset.prototype.has', 'WeakSet.prototype.has')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<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>{{CompatGeckoDesktop(34)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>23</td>
+   <td>{{CompatNo}}</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(34) }}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("WeakSet")}}</li>
+ <li>{{jsxref("WeakSet.prototype.add()")}}</li>
+ <li>{{jsxref("WeakSet.prototype.delete()")}}</li>
+</ul>
diff --git a/files/zh-cn/web/javascript/reference/global_objects/weakset/index.html b/files/zh-cn/web/javascript/reference/global_objects/weakset/index.html
new file mode 100644
index 0000000000..389a55f5e1
--- /dev/null
+++ b/files/zh-cn/web/javascript/reference/global_objects/weakset/index.html
@@ -0,0 +1,148 @@
+---
+title: WeakSet
+slug: Web/JavaScript/Reference/Global_Objects/WeakSet
+tags:
+  - WeakSet
+translation_of: Web/JavaScript/Reference/Global_Objects/WeakSet
+---
+<div>{{JSRef}}</div>
+
+<div></div>
+
+<p><strong><code>WeakSet</code></strong> 对象允许你将<em>弱保持对象</em>存储在一个集合中。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"> new WeakSet([iterable]);</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>iterable</dt>
+ <dd>如果传入一个<a href="/zh-CN/docs/Web/JavaScript/Reference/Statements/for...of">可迭代对象</a>作为参数, 则该对象的所有迭代值都会被自动添加进生成的 <code>WeakSet</code> 对象中。null 被认为是 undefined。</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_WeakSet对象">使用 <code>WeakSet</code>对象</h3>
+
+<pre class="brush: js">var ws = new WeakSet();
+var foo = {};
+var bar = {};
+
+ws.add(foo);
+ws.add(bar);
+
+ws.has(foo);    // true
+ws.has(bar);   // true
+
+ws.delete(foo); // 从set中删除 foo 对象
+ws.has(foo);    // false, foo 对象已经被删除了
+ws.has(bar);    // true, bar 依然存在</pre>
+
+<p>注意， <code>foo  !==  bar</code>。 尽管它们是相似的对象，但是它们不是<em><strong>同一个对象。</strong></em>因此，它们都可以被加入到set中。</p>
+
+<h2 id="描述">描述</h2>
+
+<p><code>WeakSet</code> 对象是一些对象值的集合, 并且其中的每个对象值都只能出现一次。在<code>WeakSet</code>的集合中是唯一的</p>
+
+<p>它和 {{jsxref("Set")}} 对象的区别有两点:</p>
+
+<ul>
+ <li>与<code>Set</code>相比，<code>WeakSet</code> 只能是<strong>对象的集合</strong>，而不能是任何类型的任意值。</li>
+ <li><code>WeakSet</code>持弱引用：集合中对象的引用为弱引用。 如果没有其他的对<code>WeakSet</code>中对象的引用，那么这些对象会被当成垃圾回收掉。 这也意味着WeakSet中没有存储当前对象的列表。 正因为这样，<code>WeakSet</code> 是不可枚举的。</li>
+</ul>
+
+<h3 id="检测循环引用">检测循环引用</h3>
+
+<p>递归调用自身的函数需要一种通过跟踪哪些对象已被处理，来应对循环数据结构的方法。</p>
+
+<p>为此，WeakSet非常适合处理这种情况：</p>
+
+<pre class="brush: js">// 对 传入的subject对象 内部存储的所有内容执行回调
+function execRecursively(fn, subject, _refs = null){
+	if(!_refs)
+		_refs = new WeakSet();
+
+	// 避免无限递归
+	if(_refs.has(subject))
+		return;
+
+	fn(subject);
+	if("object" === typeof subject){
+		_refs.add(subject);
+		for(let key in subject)
+			execRecursively(fn, subject[key], _refs);
+	}
+}
+
+const foo = {
+	foo: "Foo",
+	bar: {
+		bar: "Bar"
+	}
+};
+
+foo.bar.baz = foo; // 循环引用!
+execRecursively(obj =&gt; console.log(obj), foo);</pre>
+
+<p>在此，在第一次运行时创建<code>WeakSet</code>，并将其与每个后续函数调用一起传递（使用内部参数_refs）。 对象的数量或它们的遍历顺序无关紧要，因此，WeakSet比{{jsxref("Set")}}更适合（和执行）跟踪对象引用，尤其是在涉及大量对象时。</p>
+
+<h2 id="Properties" name="Properties">属性</h2>
+
+<dl>
+ <dt><code>WeakSet.length</code></dt>
+ <dd><code>length</code> 属性的值为 0.</dd>
+ <dt>{{jsxref("WeakSet.prototype")}}</dt>
+ <dd><span>表示<code>WeakSet</code>构造函数的原型。 允许向所有<code>WeakSet</code>对象添加属性。</span></dd>
+</dl>
+
+<h2 id="Boolean_instances" name="Boolean_instances"><code>WeakSet</code> 实例</h2>
+
+<p>所有 <code>WeakSet</code> 实例都继承自 {{jsxref("WeakSet.prototype")}}.</p>
+
+<h3 id="属性">属性</h3>
+
+<p>{{page('zh-CN/Web/JavaScript/Reference/Global_Objects/WeakSet/prototype','Properties')}}</p>
+
+<h3 id="方法">方法</h3>
+
+<p>{{page('zh-CN/Web/JavaScript/Reference/Global_Objects/WeakSet/prototype','Methods')}}</p>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <td>规范链接</td>
+   <td>规范状态</td>
+   <td>备注</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES2015', '#sec-weakset-objects', 'WeakSet')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-weakset-objects', 'WeakSet')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div class="hidden">
+<p>The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+</div>
+
+<p>{{Compat("javascript.builtins.WeakSet")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Map")}}</li>
+ <li>{{jsxref("Set")}}</li>
+ <li>{{jsxref("WeakMap")}}</li>
+</ul>
diff --git a/files/zh-cn/web/javascript/reference/global_objects/weakset/prototype/index.html b/files/zh-cn/web/javascript/reference/global_objects/weakset/prototype/index.html
new file mode 100644
index 0000000000..3f323d5fe2
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+++ b/files/zh-cn/web/javascript/reference/global_objects/weakset/prototype/index.html
@@ -0,0 +1,114 @@
+---
+title: WeakSet.prototype
+slug: Web/JavaScript/Reference/Global_Objects/WeakSet/prototype
+translation_of: Web/JavaScript/Reference/Global_Objects/WeakSet
+---
+<div>{{JSRef("Global_Objects", "WeakSet")}}</div>
+
+<h2 id="Summary" name="Summary">Summary</h2>
+
+<p>The <code><strong>WeakSet</strong></code><strong><code>.prototype</code></strong> property represents the prototype for the {{jsxref("WeakSet")}} constructor.</p>
+
+<div>{{js_property_attributes(0,0,0)}}</div>
+
+<h2 id="Description" name="Description">Description</h2>
+
+<p>{{jsxref("WeakSet")}} instances inherit from {{jsxref("WeakSet.prototype")}}. You can use the constructor's prototype object to add properties or methods to all <code>WeakSet</code> instances.</p>
+
+<h2 id="Properties">Properties</h2>
+
+<dl>
+ <dt><code>WeakSet.prototype.constructor</code></dt>
+ <dd>返回构造函数即 {{jsxref("WeakSet")}} 本身.</dd>
+</dl>
+
+<h2 id="Methods">Methods</h2>
+
+<dl>
+ <dt>{{jsxref("WeakSet.add", "WeakSet.prototype.add(value)")}}</dt>
+ <dd> 在<span style="line-height: 1.5;">该 </span><code style="font-size: 14px;">WeakSet</code><span style="line-height: 1.5;"> 对象中添加一个新元素 <code>value</code>.</span></dd>
+ <dt>{{jsxref("WeakSet.delete", "WeakSet.prototype.delete(value)")}}</dt>
+ <dd>从<span style="line-height: 1.5;">该 </span><code style="font-size: 14px;">WeakSet</code><span style="line-height: 1.5;"> 对象中删除</span><span style="line-height: 1.5;"> </span><code style="font-size: 14px;">value </code><span style="line-height: 1.5;">这个元素, 之后 </span><code style="font-size: 14px;">WeakSet.prototype.has(value)</code><span style="line-height: 1.5;"> 方法便会返回 </span><code style="font-size: 14px;">false</code><span style="line-height: 1.5;">.</span></dd>
+ <dt>{{jsxref("WeakSet.has", "WeakSet.prototype.has(value)")}}</dt>
+ <dd>返回一个布尔值,  表示给定的值 <code>value</code> 是否存在于这个 <code>WeakSet</code> 中.</dd>
+</dl>
+
+<h2 id="Specifications">Specifications</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-weakset.prototype', 'WeakSet.prototype')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</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>{{ CompatVersionUnknown() }}</td>
+   <td>{{ CompatNo() }} {{bug(792439)}}</td>
+   <td>{{ CompatNo() }}</td>
+   <td>{{ CompatNo() }}</td>
+   <td>{{ CompatNo() }}</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() }} {{bug(792439)}}</td>
+   <td>{{ CompatNo() }}</td>
+   <td>{{ CompatNo() }}</td>
+   <td>{{ CompatNo() }}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h3 id="Chrome-specific_notes">Chrome-specific notes</h3>
+
+<ul>
+ <li>This feature is available behind a preference. In <code style="font-size: 14px;">chrome://flags</code>, activate the entry “Enable Experimental JavaScript”.</li>
+</ul>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("Set.prototype")}}</li>
+ <li>{{jsxref("WeakMap.prototype")}}</li>
+</ul>