After following, you can keep track of his dynamic information in a timely manner
Courses in the relevant section：What are events in JavaScript
onclick事件
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Courses in the relevant section：JavaScript mouse over event (onmouseover)
鼠标经过的事件（onmousover）
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Courses in the relevant section：JavaScript mouse move event (onmouseout)
当鼠标移开该对象时，触发onmouseout事件
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