事件处理
<h3 id="监听事件">监听事件
<h4 id="event.preventdefault-event.stoppropagation">event.preventDefault() event.stopPropagation()
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<h3 id="监听事件">监听事件
<h4 id="event.preventdefault-event.stoppropagation">event.preventDefault() event.stopPropagation()
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