setTimeout(fn，0)和setTimeout(fn，1)有什么区别? [英] What is the difference between setTimeout(fn, 0) and setTimeout(fn, 1)?

问题描述

jQuery来源结合使用setTimeout和和1作为第二个参数.我的印象是，它们都意味着尽快执行功能".

The jQuery source features uses of setTimeout with both 0 and 1 as second argument. I'm under the impression that they both mean "execute the function as soon as you can".

这是正确的吗?两者之间有区别吗?

Is this correct? Is there a difference between the two?

推荐答案

我认为答案是取决于".现在.

I think the answer is "It depends" now.

我们可以在不同的平台和浏览器中运行代码:

We can run the code in different platform and browsers:

function setTimeouts() {
  setTimeout(function() { console.log(2); }, 2);
  setTimeout(function() { console.log(1); }, 1);
  setTimeout(function() { console.log(0); }, 0);
}

for (var i = 0; i < 10; i++) {
  setTimeouts();
}

1. 对于Node.js，0转换为1，因此它们完全相同:

1. For Node.js, 0 is converted to 1, so they are exactly the same: https://github.com/nodejs/node/blob/master/lib/timers.js#L319, and result might be:

 1
 0
 1
 0
 1
 0
 1
 0
 1
 0
 1
 0
 1
 0
 1
 0
 1
 0
 1
 0
 2
 2
 2
 2
 2
 2
 2
 2
 2
 2

对于Chrome，结果与Node.js非常相似

For Chrome, the result is quite similar with Node.js

对于Firefox，大多数0都将在1之前打印:

For Firefox, most of 0 will be printed before 1:

 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 1
 1
 1
 1
 1
 1
 1
 1
 1
 1
 2
 2
 2
 2
 2
 2
 2
 2
 2
 2

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