getTime()
方法返回一个时间的格林威治时间数值。
你可以使用这个方法把一个日期时间赋值给另一个valueOf()
方法一样。
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
语法
dateObj.getTime()
参数
无。
返回值
getTime
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。
例子
使用 getTime() 复制日期对象
创建一个拥有相同时间值的日期对象。
var birthday = new Date(1991, 9, 17); var copy = new Date(); copy.setTime(birthday.getTime());
测量代码执行时间
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Date.now()
var end, start, i; start = new Date(); for (i = 0; i < 1000; i++) { Math.sqrt(i); } end = new Date(); console.log("Operation took " + (end.getTime() - start.getTime()) + " msec");
规范
规范版本 | 规范状态 | 说明 |
---|---|---|
ECMAScript 1st Edition (ECMA-262) | Standard | 初始定义 |
ECMAScript 5.1 (ECMA-262) Date.prototype.getTime |
Standard | |
ECMAScript 2015 (6th Edition, ECMA-262) Date.prototype.getTime |
Standard |
浏览器兼容性
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
getTime |
Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 4 | Opera Full support Yes | Safari Full support Yes | WebView Android Full support 1 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
Legend
- Full support
- Full support