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It's easy to write breakpoints in your own code, and firebug will jump directly to the breakpoint.

But there is often an old problem. Looking at other people's code, a lot of js is loaded on it. Since js jquery is usually event-bound, js actions are not written directly in html tags. At this time:

1. When the mouse moves over an element and an action is generated, how to locate which function of which js file is executed by this action?

2. This leads to another question, how to debug js without breakpoints? When the mouse moves over an element, breakpoints are automatically broken

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