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+---
+title: Number.prototype.valueOf()
+slug: Web/JavaScript/Reference/Global_Objects/Number/valueOf
+tags:
+  - JavaScript
+  - Method
+  - Number
+  - valueOf()
+translation_of: Web/JavaScript/Reference/Global_Objects/Number/valueOf
+---
+<div>{{JSRef("Global_Objects", "Number")}}</div>
+
+<h2 id="Summary" name="Summary">概述</h2>
+
+<p><strong><code>valueOf()</code></strong> 方法返回一个被 {{jsxref("Global_Objects/Number", "Number")}} 对象包装的原始值。</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox"><code><var>numObj</var>.valueOf()</code></pre>
+
+<h3 id="Parameters" name="Parameters">返回值</h3>
+
+<p>表示指定 {{jsxref("Number")}} 对象的原始值的数字</p>
+
+<h2 id="Description" name="Description">描述</h2>
+
+<p>该方法通常是由 JavaScript 引擎在内部隐式调用的，而不是由用户在代码中显式调用的。</p>
+
+<h2 id="Examples" name="Examples">示例</h2>
+
+<pre class="brush: js">var numObj = new Number(10);
+console.log(typeof numObj); // object
+
+var num = numObj.valueOf();
+console.log(num);           // 10
+console.log(typeof num);    // number
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范名称</th>
+   <th scope="col">规范状态</th>
+   <th scope="col">备注</th>
+  </tr>
+  <tr>
+   <td>ECMAScript 1st Edition.</td>
+   <td>Standard</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.7.4.4', 'Number.prototype.valueOf')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-number.prototype.valueof', 'Number.prototype.valueOf')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<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>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</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>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also" name="See_also">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Number.prototype.toSource()")}}</li>
+</ul>