Can I stop JavaScript function execution via global variables?

So I read through this a bit, and it looks like JavaScript functions can't be explicitly killed off mid-run. What if I have a global variable, window.currentlyProcessing that manages this.

function contentsChanged()
{
    if( window.curentlyProcessing == true )
    {
        return;
    }
    window.curentlyProcessing = true;
    // DO STUFF
    windo开发者_JAVA百科w.curentlyProcessing = false;
}

Since contentsChanged gets called a lot, will this effectively stop it from running over itself?

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Javascript is single threaded - one function is executed at a time, the function will never "run over itself" to begin with. contentsChanged will get called, will execute until the end, then any other stuff will happen.

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That would prevent the logic from running if it's already running. If that's what you need to do, it should work.