如何比较Javascript中的日期？

I have the following situation:

我有以下情况:

I have a certain function that runs a loop and does stuff, and error conditions may make it exit that loop. I want to be able to check whether the loop is still running or not.

我有一个运行循环并执行操作的特定函数,错误条件可能使它退出该循环。我希望能够检查循环是否仍在运行。

For this, i'm doing, for each loop run:

为此,我正在做,为每个循环运行:

LastTimeIDidTheLoop = new Date();

And in another function, which runs through SetInterval every 30 seconds, I want to do basically this:

在另一个每隔30秒运行一次SetInterval的函数中,我想基本上这样做:

if (LastTimeIDidTheLoop is more than 30 seconds ago) {
  alert("oops");
}

How do I do this?

我该怎么做呢?

Thanks!

4 个解决方案

#1

what about:

newDate = new Date()
newDate.setSeconds(newDate.getSeconds()-30);
if (newDate > LastTimeIDidTheLoop) {
  alert("oops");
}

#2

JS date objects store milliseconds internally, subtracting them from each other works as expected:

JS日期对象在内部存储毫秒,相互减去它们按预期工作:

var diffSeconds = (new Date() - LastTimeIDidTheLoop) / 1000; 
if (diffSeconds > 30)
{
  // ...
}

#3

You can do like this:

你可以这样做:

var dateDiff = function(fromdate, todate) {
    var diff = todate - fromdate;
    return Math.floor(diff/1000);
}

then:

if (dateDiff(fromdate, todate) > 30){
    alert("oops");
}

#4

-1

Create a date object and use setSeconds().

创建日期对象并使用setSeconds()。

controlDate = new Date();
controlDate.setSeconds(controlDate.getSeconds() + 30);

if (LastTimeIDidTheLoop > controlDate) {
...

#1