performance.now() 与 Date.now() [英] performance.now() vs Date.now()

问题描述

performance.now() 和 Date.now() 有什么区别?

我是否应该考虑将 performance.now() 作为 Date.now() 的替代品，因为 performace.now() 更一致和独立?

Should I consider performance.now() as a replacement for Date.now() since performace.now() is more consistent and independent?

推荐答案

它们都有不同的用途.

performance.now() 相对于页面加载，并且在数量级上更精确.用例包括基准测试和其他需要高分辨率时间的情况，例如媒体(游戏、音频、视频等)

performance.now() is relative to page load and more precise in orders of magnitude. Use cases include benchmarking and other cases where a high-resolution time is required such as media (gaming, audio, video, etc.)

需要注意的是，performance.now() 仅适用于较新的浏览器(包括 IE10+).

It should be noted that performance.now() is only available in newer browsers (including IE10+).

Date.now() 相对于 Unix 纪元 (1970-01-01T00:00:00Z) 并依赖于系统时钟.用例包括自 JavaScript 开始以来相同的旧日期操作.

Date.now() is relative to the Unix epoch (1970-01-01T00:00:00Z) and dependent on system clock. Use cases include same old date manipulation ever since the beginning of JavaScript.

参见 当毫秒不是足够了:performance.now 和 now 方法 (Internet Explorer) - MSDN 了解更多信息.

See When milliseconds are not enough: performance.now and now method (Internet Explorer) - MSDN for more information.

官方 W3C 规范可以在这里找到:高分辨率时间 API

The official W3C spec can be found here: High Resolution Time API

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