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How to Debug java Script Error Using Firebug?
How can I set breakpoints in an external JS script in Firebug
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In Chrome, navigate to Tools > Advanced > Error Console. The error console will open. Select JavaScript and Errors from the two drop downs. To find the error location, expand one of the errors.
But fortunately, all modern browsers have a built-in JavaScript debugger. Built-in debuggers can be turned on and off, forcing errors to be reported to the user. With a debugger, you can also set breakpoints (places where code execution can be stopped), and examine variables while the code is executing.
Debug using FireBug.
Just check the line on which the error is occuring, then, just before that line, write a "debugger" call.
debugger; //Will invoke FireBug's debugger.
var err = abcs; //Line containing error
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