JavaScript:如何每隔一小时做某事? [英] JavaScript: How to do something every full hour?

问题描述

我想每小时执行一些 JS 代码.但是我不能用

I want to execute some JS code every hour. But I can't use

setInterval("javascript function",60*60*1000);

因为我想每隔一个小时做一次，我的意思是在 1:00、2:00、3:00 等等.我正在考虑类似的事情

because I want to do it every full hour, I mean in 1:00, in 2:00, in 3:00 and so on. I am thinking about something like

var d;
while(true) {
  d = new Date();
  if ((d.getMinutes() == '00') && (d.getSeconds() == '00')){
    // my code here
  }  
}

但是速度太慢，效果不佳.

but it's too slow and it doesn't work well.

感谢您的任何想法

推荐答案

我会找出现在几点，弄清楚距离下一个完整小时还有多久，然后等待那么长时间.所以，

I would find out what time it is now, figure out how long it is until the next full hour, then wait that long. So,

function doSomething() {
    var d = new Date(),
        h = new Date(d.getFullYear(), d.getMonth(), d.getDate(), d.getHours() + 1, 0, 0, 0),
        e = h - d;
    if (e > 100) { // some arbitrary time period
        window.setTimeout(doSomething, e);
    }
    // your code
}

检查e >100 只是为了确保您不会在 5 毫秒之类的时间里执行 setTimeout 并陷入疯狂循环.

The check for e > 100 is just to make sure you don't do setTimeout on something like 5 ms and get in a crazy loop.

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