Chrome JavaScript Debugging: how to break when a value changes

Question

I am debugging a large JavaScript code base where, at some point, the \"console\" variable gets nulled when refreshing the page.

Is there a way to set a watch on con

Answer 1

You can't touch the console object... never, ever. The only thing that can happen is that a console variable is declared in a scope/namespace, other than the global scope, hiding the global console. You can still access it using window.console, though. Other than that, the only things I can think of that cause this are:

• You've set the user agent in your console overrides to emulate a version of IE that doesn't support console
• Your code is throwing an error because of some other problem with your code
• As @alexandernst pointed out: you're overriding a property of the console object. Delete the method you're unable to access and you're fine

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To find out where you need to look in the code set conditional breakpoints and watch a couple of expressions, and use the pause on uncaught exceptions button