我可以看看计时器是否仍在运行吗？ [英] Can I see if a timer is still running?

问题描述

这里简单的问题我似乎无法找到答案：一旦设置了 setTimeout ，有没有办法看看它是否仍然，好吧，设置？

Simple question here that I can't seem to find an answer for: Once a setTimeout is set, is there any way to see if it's still, well, set?

if (!Timer)
{
    Timer = setTimeout(DoThis,60000);
}

据我所知，当你 clearTimeout ，变量保持在其最后一个值。一个 console.log 我只是将计时器显示为'12'，无论是否设置了超时或清除。我是否也必须将变量置零，或者使用其他变量作为布尔说法，是的，我已设置此计时器？当然有一种方法可以检查超时是否仍在运行......对吗？我不需要知道剩下多长时间，只要它还在运行。

From what I can tell, when you clearTimeout, the variable remains at its last value. A console.log I just looked at shows Timer as being '12', no matter if the timeout has been set or cleared. Do I have to null out the variable as well, or use some other variable as a boolean saying, yes, I have set this timer? Surely there's a way to just check to see if the timeout is still running... right? I don't need to know how long is left, just if it's still running.

推荐答案

无论如何都无法互动使用计时器除了启动或停止它。我通常在超时处理程序中清空timer变量，而不是使用标志来指示计时器未运行。有关计时器如何工作的 W3Schools 有一个很好的描述。在他们的示例中，他们使用标志变量。

There isn't anyway to interact with the timer except to start it or stop it. I typically null the timer variable in the timeout handler rather than use a flag to indicate that the timer isn't running. There's a nice description on W3Schools about how the timer works. In their example they use a flag variable.

您看到的值是 句柄 到当前计时器，当你清除（停止）它时使用它。

The value you are seeing is a handle to the current timer, which is used when you clear (stop) it.

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