From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: Date.prototype.valueOf()
+slug: Web/JavaScript/Reference/Global_Objects/Date/valueOf
+tags:
+  - Date
+  - JavaScript
+  - 原型
+  - 参考
+  - 方法
+  - 日期
+translation_of: Web/JavaScript/Reference/Global_Objects/Date/valueOf
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>valueOf()</strong></code> 方法返回一个 {{jsxref("Date")}} 对象的原始值。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/date-valueof.html")}}</div>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox"><code><var>dateObj</var>.valueOf()</code></pre>
+
+<h3 id="Parameters" name="Parameters">返回值</h3>
+
+<p>从1970年1月1日0时0分0秒（UTC，即协调世界时）到该日期的毫秒数。</p>
+
+<h2 id="Description" name="Description">描述</h2>
+
+<p><code>valueOf</code> 方法返回以数值格式表示的一个 <code>Date</code> 对象的原始值，从1970年1月1日0时0分0秒（UTC，即协调世界时）到该日期对象所代表时间的毫秒数。</p>
+
+<p>该方法的功能和 {{jsxref("Date.prototype.getTime()")}} 方法一样。</p>
+
+<p>该方法通常在 JavaScript 内部被调用，而不是在代码中显式调用。</p>
+
+<h2 id="Examples" name="Examples">例子</h2>
+
+<h3 id="Example:_Using_valueOf" name="Example:_Using_valueOf">使用 <code>valueOf()</code></h3>
+
+<pre class="brush:js">var x = new Date(56, 6, 17);
+var myVar = x.valueOf();      // assigns -424713600000 to myVar
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范版本</th>
+   <th scope="col">规范状态</th>
+   <th scope="col">注解</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES1')}}</td>
+   <td>{{Spec2('ES1')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.9.5.8', 'Date.prototype.valueOf')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-date.prototype.valueof', 'Date.prototype.valueOf')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-date.prototype.valueof', 'Date.prototype.valueOf')}}</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 class="hidden">The compatibility table in 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>
+
+<p>{{Compat("javascript.builtins.Date.valueOf")}}</p>
+
+<h2 id="See_Also" name="See_Also">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Object.prototype.valueOf()")}}</li>
+ <li>{{jsxref("Date.prototype.getTime()")}}</li>
+</ul>
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