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+---
+title: Symbol.keyFor()
+slug: Web/JavaScript/Reference/Global_Objects/Symbol/keyFor
+translation_of: Web/JavaScript/Reference/Global_Objects/Symbol/keyFor
+---
+<div>{{JSRef("Global_Objects", "Symbol")}}</div>
+
+<h2 id="Summary" name="Summary">概述</h2>
+
+<p><code><strong>Symbol.keyFor(sym)</strong></code> 方法用来获取全局symbol 注册表中与某个 symbol 关联的键。</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox notranslate"><var>Symbol.keyFor(sym)</var>;</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>sym</dt>
+ <dd>必选参数，需要查找键值的某个 Symbol 。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<dl>
+ <dd>如果全局注册表中查找到该symbol，则返回该symbol的key值，返回值为字符串类型。否则返回undefined</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush: js notranslate">// 创建一个全局 Symbol
+var globalSym = Symbol.for("foo");
+Symbol.keyFor(globalSym); // "foo"
+
+var localSym = Symbol();
+Symbol.keyFor(localSym); // undefined，
+
+// 以下Symbol不是保存在全局Symbol注册表中
+Symbol.keyFor(Symbol.iterator) // undefined
+</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-symbol.keyfor', 'Symbol.keyFor')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</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>{{ CompatNo() }}</td>
+   <td>{{ CompatGeckoDesktop("33.0") }}</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>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("33.0") }}</td>
+   <td>{{ CompatNo() }}</td>
+   <td>{{ CompatNo() }}</td>
+   <td>{{ CompatNo() }}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_Also" name="See_Also">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Symbol.prototype.for()")}}</li>
+</ul>