javascript功能_JavaScript睡眠功能

落日映苍穹つ 2023-02-22 03:35 8阅读 0赞

javascript功能

The infamous `sleep`, or `delay`, function within any language is much debated.  Some will say that there should always be a signal or callback to fire a given functionality, others will argue that sometimes an arbitrary moment of delay is useful.  I say that to each their own and one rule can never dictate anything in this industry.

臭名昭著的`sleep`或`delay`功能在任何语言中都存在很多争议。 有些人会说应该总是有一个信号或回调来触发给定的功能，另一些人则认为有时任意的延迟时间是有用的。 我说，在这个行业中，对每个人来说，一条规则永远不能决定任何事情。

Writing a `sleep` function is simple and made even more usable with [JavaScript Promises][]:

编写`sleep`函数非常简单，并且可以通过[JavaScript Promises][]进一步使用：

// https://zeit.co/blog/async-and-await
    function sleep (time) {
      return new Promise((resolve) => setTimeout(resolve, time));
    }
    
    // Usage!
    sleep(500).then(() => {
        // Do something after the sleep!
    })

Without [promises][] you'd need to pass a callback; with our beautiful promises we simply resolve after the `setTimeout` and use `then` with the result to execute the next step.  You'll also note that the demo above uses [ES6 arrow functions][].

没有[承诺，][promises]您将需要传递回调； 有了我们美好的承诺，我们只需在`setTimeout`之后解决， `then`其与结果一起使用即可执行下一步。 您还将注意到，上面的演示使用了[ES6箭头功能][ES6 arrow functions] 。

> 翻译自: [https://davidwalsh.name/javascript-sleep-function][https_davidwalsh.name_javascript-sleep-function]

javascript功能

[JavaScript Promises]: https://davidwalsh.name/promises
[promises]: https://davidwalsh.name/tutorials/promises
[ES6 arrow functions]: https://davidwalsh.name/es2015-babel
[https_davidwalsh.name_javascript-sleep-function]: https://davidwalsh.name/javascript-sleep-function