stop Javascript function with another Javascript call?

In the o开发者_高级运维riginal Javascript is there I want this to stop it

setTimeout('open_popup()',  200);

What is function To stop this from another file js

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setTimeout returns a handle that you can use the clear the timeout:

var timer = setTimeout(open_popup,  200);

clearTimeout(timer);

That of course assumes you put the timer variable in a scope that is accessible to both scripts and that you clear the timeout before it fires.