lovecoding
/
Web1020


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box1{
            width: 400px;
            height: 400px;
            background-color: red;
        }
        .box2{
            width: 200px;
            height: 200px;
            background-color: blue;
        }
        .box3{
            width: 100px;
            height: 100px;
            background-color: green;
        }
    </style>
</head>
<body>
    <div class="box1">
        <div class="box2">
            <div class="box3"></div>
        </div>
    </div>
    <script>
        // 事件冒泡 当有多个元素嵌套的时候 并且绑定相同事件当内层元素触发事件的时候 会逐层触发外层元素的事件
        var oBox1 = document.getElementsByClassName("box1")[0];
        var oBox2 = document.getElementsByClassName("box2")[0];
        var oBox3 = document.getElementsByClassName("box3")[0];
        oBox1.onclick = function(){
            console.log("box1");
        }
        oBox2.onclick = function(){
            console.log("box2");
        }
        oBox3.onclick = function(e){
            console.log("box3");
            // 阻止事件冒泡
            e.stopPropagation();
        }
    </script>
</body>
</html>