js中addEventListener中第3個參數（事件捕獲過程和冒泡過程）

<div id= "id1"  style= "width:200px; height:200px; position:absolute; top:100px; left:100px; background-color:blue; z-index:4" >        <div id= "id2"  style= "width:200px; height:200px; position:abso

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