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+---
+title: Date.prototype.getTime()
+slug: Web/JavaScript/Reference/Global_Objects/Date/getTime
+tags:
+ - Date
+ - JavaScript
+ - 原型
+ - 方法
+translation_of: Web/JavaScript/Reference/Global_Objects/Date/getTime
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>getTime()</strong></code> 方法返回一个时间的格林威治时间数值。</p>
+
+<p>你可以使用这个方法把一个日期时间赋值给另一个{{jsxref("Date")}} 对象。这个方法的功能和 {{jsxref("Date.valueof", "valueOf()")}} 方法一样。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/date-gettime.html")}}</div>
+
+
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox"><code>dateObj.getTime() </code></pre>
+
+<h3 id="Parameters" name="Parameters">参数</h3>
+
+<p>无。</p>
+
+<h3 id="Description" name="Description">返回值</h3>
+
+<p><code>getTime</code> 方法的返回值一个数值,表示从1970年1月1日0时0分0秒(UTC,即协调世界时)距离该日期对象所代表时间的毫秒数。</p>
+
+<h2 id="Examples" name="Examples">例子</h2>
+
+<h3 id="使用_getTime()_复制日期对象">使用 getTime() 复制日期对象</h3>
+
+<p>创建一个拥有相同时间值的日期对象。</p>
+
+<pre class="brush: js">var birthday = new Date(1991, 9, 17);
+var copy = new Date();
+copy.setTime(birthday.getTime());
+</pre>
+
+<h3 id="测量代码执行时间">测量代码执行时间</h3>
+
+<p>连续调用两个新生成的日期对象的 getTime 方法,根据两次调用的返回值求得时间差。这可以用于计算某些操作的执行时间。避免生成不必要的{{jsxref("Date")}}对象另见{{jsxref("Date.now()")}} </p>
+
+<pre class="brush:js">var end, start, i;
+
+start = new Date();
+for (i = 0; i &lt; 1000; i++) {
+ Math.sqrt(i);
+}
+end = new Date();
+
+console.log("Operation took " + (end.getTime() - start.getTime()) + " msec");</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">说明</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES1')}}</td>
+ <td>{{Spec2('ES1')}}</td>
+ <td>初始定义</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES5.1', '#sec-15.9.5.9', 'Date.prototype.getTime')}}</td>
+ <td>{{Spec2('ES5.1')}}</td>
+ <td> </td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES6', '#sec-date.prototype.gettime', 'Date.prototype.getTime')}}</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>
+
+<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.getTime")}}</p>
+
+<h2 id="See_Also" name="See_Also">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Date.prototype.setTime()")}}</li>
+ <li>{{jsxref("Date.prototype.valueOf()")}}</li>
+ <li>{{jsxref("Date.now()")}}</li>
+</ul>