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+---
+title: WeakRef.prototype.deref()
+slug: Web/JavaScript/Reference/Global_Objects/WeakRef/deref
+translation_of: Web/JavaScript/Reference/Global_Objects/WeakRef/deref
+---
+<div>{{JSRef}}</div>
+
+<div></div>
+
+<div><code>deref</code>方法返回{{jsxref("WeakRef")}} 实例的目标对象，如果目标对象已被垃圾收集，则返回<code>undefined</code> 。</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate"><code><var>obj</var> = <var>ref</var>.deref();</code>
+</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>返回WeakRef的目标对象，如果该对象已被垃圾收集，则返回<code>undefined</code> 。</p>
+
+<h2 id="说明">说明</h2>
+
+<p>有关一些重要说明，请参阅{{jsxref("WeakRef")}}页面上的<a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakRef#Notes_on_WeakRefs">Notes on WeakRefs</a> 。</p>
+
+<h2 id="例子">例子</h2>
+
+<h3 id="使用deref">使用deref</h3>
+
+<p>有关<a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakRef#Examples">完整示例</a>，请参阅{{jsxref("WeakRef")}}页面的示例部分。</p>
+
+<pre class="brush: js notranslate">const tick = () =&gt; {
+  // Get the element from the weak reference, if it still exists
+  const element = this.ref.deref();
+  if (element) {
+    element.textContent = ++this.count;
+  } else {
+    // The element doesn't exist anymore
+    console.log("The element is gone.");
+    this.stop();
+    this.ref = null;
+  }
+};</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">规范</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('WeakRefs', '#sec-weak-ref.prototype.deref', 'WeakRef.prototype.deref()')}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.builtins.WeakRef.deref")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("WeakRef")}}</li>
+</ul>