javascript setInterval 的最大延迟是多少？
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What is the maximum delay for setInterval?
提问by Nogwater
I'm having problems on Firefox 15 and Chrome 21 with the following code:
我在 Firefox 15 和 Chrome 21 上遇到问题，代码如下：
setInterval(function () { console.log('test') }, 300000000000)
On both browsers, the function is run right away repeats very quickly. Sure, that's a big number (representing about 10 years from now), but I wouldn't expect it to be treated as a tiny or negative number. I haven't seen a maximum allowed delay in any documentation. Does anyone know if there's a standard max, or if this is just the browsers being funny?
在这两种浏览器上，立即运行的功能会非常快速地重复。当然，这是一个很大的数字（代表从现在开始大约 10 年），但我不希望它被视为一个很小的或负数。我在任何文档中都没有看到最大允许延迟。有谁知道是否有标准最大值，或者这只是浏览器很有趣吗？
采纳答案by Pointy
I can't find any documentation at the moment, but I wouldn't be surprised if the timer value had to fit in a 32-bit signed integer.
我目前找不到任何文档，但如果计时器值必须适合 32 位有符号整数，我不会感到惊讶。
回答by Aaron Dufour
The interval is stored in a signed 32-bit int (in the tested implementation: V8 in Google Chrome), so the behavior you're seeing is the result of the interval overflowing to a negative number (in which case it behaves as if the interval was 0). Thus, the maximum interval that you can use is 2**31 - 1.
间隔存储在一个有符号的 32 位整数中（在测试的实现中：谷歌浏览器中的 V8），所以你看到的行为是间隔溢出到负数的结果（在这种情况下，它的行为就像间隔是0）。因此，您可以使用的最大间隔是2**31 - 1。
Here's how I determined that this was the case:
以下是我如何确定情况确实如此：
setInterval(function(){console.log("hi");}, Math.pow(2,31));
Behaves like the interval is 0.
表现得像间隔是0。
setInterval(function(){console.log("hi");}, Math.pow(2,31) - 1);
Doesn't fire in the time I was willing to wait.
在我愿意等待的时候没有开火。
setInterval(function(){console.log("hi");}, Math.pow(2,33) + 1000);
Behaves like the interval is 1000(one second). Here, the 2**33doesn't affect the first 32 bits, so we get just 1000.
表现得像间隔是1000（一秒）。在这里，2**33不影响前 32 位，所以我们只得到1000.
The highest possible interval, 2**31-1msis a little shy of 25 days, so more than enough for anything reasonable.
可能的最高间隔时间2**31-1ms略短于 25 天，因此对于任何合理的事情来说都绰绰有余。
回答by rekire
I think that the maximum delay is 231-1 which is 2,147,483,647ms. The maximum value of a signed 32 bit integer in ms. If it would be unsigned it would be 232-1 = 4,294,967,295.
我认为最大延迟是 2 31-1，即 2,147,483,647ms。以毫秒为单位的有符号 32 位整数的最大值。如果它是无符号的，它将是 2 32-1 = 4,294,967,295。
回答by Xin
Max is 2,147,483,647(231-1)
最大值是2,147,483,647(2 31-1)
Be careful that if you make the number bigger than that, it will run immediately (Imaging that you put a negative value, so the browser will run infinitely loop)
请注意，如果您将数字设置为大于该数字，它将立即运行（想象您输入了负值，因此浏览器将无限循环运行）
setInterval(()=>console.log('n'),2147483647)
31
setInterval(()=>console.log('y'),2147483648)
38
(1588) y
