Google Developer Tools

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Breakpoint Type	Use This When You Want To Pause...
Line-of-code	On an exact region of code.
Conditional line-of-code	On an exact region of code, but only when some other condition is true.
DOM	On the code that changes or removes a specific(特殊的) DOM node, or its children.
XHR	When an XHR URL contains a string pattern.
Event listener	On the code that runs after an event, such as click, is fired.
Exception	On the line of code that is throwing a caught or uncaught exception(例外).
Function	Whenever a specific function is called.