Pausing code execution in chrome from within JS. Possible?

Question

Can I pause execution from within JS code? I am working on a simple haxe-based debug util, and I want to be able to simulate breakpoints, by calling a util method which will trigger the execution pause.

James Allardice · Accepted Answer · 2011-11-20 09:27:53Z

17

Not sure if this is what you're looking for, but in Chrome (and Firefox if Firebug is installed) you can use the built-in JavaScript debugger statement. This causes the execution to pause, and is effectively like setting a breakpoint. For example, the following would break on every iteration of the loop allowing you to examine the value of i (stupidly simple example):

for(var i = 0; i < 10; i++) {
    debugger;
    console.log(i);
}

answered Nov 20, 2011 at 9:27

James Allardice

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2 Comments

Jason O'Neil Over a year ago

In Haxe, this can be done untyped __js__('debugger'); Hopefully for haxe 3 we can add a simple function, such as js.Lib.debugger();

Lester Peabody Over a year ago

Pretty cool. Now if there was a keyboard shortcut that could inject the debugger statement into the console, that would be amazing.

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