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                            ## 阻止事件冒泡
```
    <style>

        #box1 {
            width: 300px;
            height: 300px;
            background-color: pink;
        }

        #box2 {
            width: 200px;
            height: 200px;
            background-color: black;
        }

        #box3 {
            width: 100px;
            height: 100px;
            background-color: skyblue;
        }


    </style>
</head>
<body>
<div id="box1">
    <div id="box2">
        <div id="box3"></div>
    </div>
</div>


<script>
    var box1 = document.getElementById('box1');
    var box2 = document.getElementById('box2');
    var box3 = document.getElementById('box3');

    var arr = [box1, box2, box3];

    for (let i = 0; i < arr.length; i++) {
        var box = arr[i];
        box.onclick = function (e) {
            console.log(this.id);
            e.stopPropagation();        //停止事件傳播,取消冒泡

            //老版本的IE瀏覽器,非標準的方式,chrome也支持
            e.cancelBubble = true;
        }
    }
</script>
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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