setTimeout(fn，0)和setTimeout(fn，1)之间的区别? [英] Difference between setTimeout(fn, 0) and setTimeout(fn, 1)?

问题描述

jquery源的功能是同时使用setTimeout和0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

我认为答案现在是取决于".

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

这篇关于setTimeout(fn，0)和setTimeout(fn，1)之间的区别?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！