lovecoding
/
class


			
				
					
						
						
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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>
        div {
            margin-top: 20px;
        }
        #box1 {
            width: 600px;
            height: 600px;
            background-color: red;
        }
        #box2 {
            width: 400px;
            height: 400px;
            background-color: green;
        }
        #box3 {
            width: 200px;
            height: 200px;
            background-color: blue;
        }
    </style>
</head>
<body>
    <!-- 
        事件：
            事件捕获  由外向内
            目标阶段
            事件冒泡  由内向外
     -->
    <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");
        // box1.onclick = function(event) {
        //     console.log(event)
        //     // 取消冒泡事件方法
        //     event.stopPropagation();
        //     alert("box1")

        // }
        // box2.onclick = function(event) {
        //     alert("box2")
        //     // IE浏览器
        //     event.cancelBubble = true
        //     // event.stopPropagation();
        // }
        // box3.onclick = function(event) {
        //     alert("box3")
        //     event.stopPropagation();
        // }
        // 添加监听事件
        // xxx.addEventListener(事件类型，执行的函数，开启事件类别<true 事件捕获/false 事件冒泡>)
        // xxx.removeEventListener...
        box1.addEventListener('click',function(){
            console.log("1111")
        },false)
        box2.addEventListener('click',function(){
            console.log("222")
            event.stopPropagation();
        },false)
        box3.addEventListener('click',function(){
            console.log("333")
            event.stopPropagation();
        },false)
    </script>
</body>
</html>