javascript debugging in internet explorer(IE8 +)

Press Shift-F12 after your web page is loaded. This will bring up Developer tools window. Select the "script" tab. If you have more than one js files, they will be listed in a drop down painted just adjacent to start/stop debugger button. Scroll down to the line where you wish to add the breakpoint in the code. Clicking the white column by the col number will add the break point. At this point, hit start debugger button. Your parent window might refresh.

Happy js debugging!