JavaScript 事件冒泡 

<!DOCTYPE html>
<html lang="en">


<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{padding: 50px;}
        #div1{background: blue;}
        #div2{background: brown;}
        #div3{background: orange;}
    </style>
    <script>
        window.onload = function () {
            var oDiv = document.getElementsByTagName('div');
            /*
                当点击div1时
                打印：div1


                当点击div2时
                打印： div2
                      div1


                当点击div3时
                打印   div3
                       div2
                       div1
            */
            for(var i = 0; i < oDiv.length; i++) {
                oDiv[i].onclick = function(ev) {
                    console.log(this.id);


                    // 阻止事件冒泡，但有的浏览器不兼容
                    // e.cancelBubble;
                    // e.stopPropagation();
                    var e = ev || window.target;
                    // e.cancelBubble;
                    // e.stopPropagation();
                    stopBubble(e);
                }
            }


            // 阻止事件冒泡兼容写法
            function stopBubble(e) {
                if (!e.cancelBubble) {
                    e.stopPropagation();
                } else {
                    e.cancelBubble;
                }
            }
        }
    </script>
</head>


<body>
    <div id="div1">
        <div id="div2">
            <div id="div3"></div>
        </div>
    </div>
</body>


</html>

 

posted @ 2021-02-22 22:04  独孤靖云  阅读(43)  评论(0)    收藏  举报