js事件委托 jQuery写法

时间：2025-02-02 19:36:56

http://www.cnblogs.com/liugang-vip/p/5616484.html 不是抄的，这篇文章写的细

这是js 事件委托写法

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>事件获取目标元素</title>

    <style>

        li{width: 499px;height: 50px;border: 1px solid #000;}

        ul{height: 300px;}

    </style>

</head>

<body>

    <ul id="ul1">

        <li>a</li>

        <li>2</li>

        <li>3</li>

        <li>4</li>

    </ul>

</body>

<script>

    var lis = document.getElementsByTagName("li");

    var ul1 = document.getElementById("ul1");

    ul1.onclick = function(e){

        var events = e || event;

        var target = e.target || e.srcElement;

        console.log(events.target.nodeName)

    }

</script>

</html>

下面是jQuery 写法：(用on)

 <!DOCTYPE html>

 <html lang="en">

 <head>

     <meta charset="UTF-8">

     <title>事件获取目标元素</title>

     <style>

         li{width: 499px;height: 50px;border: 1px solid #000;}

         ul{height: 300px;}

     </style>

 </head>

 <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>

 <body>

     <ul id="ul1">

         <li>a</li>

         <li>2</li>

         <li>3</li>

         <li>4</li>

     </ul>

 </body>

 <script>

     // var lis = document.getElementsByTagName("li");

     // var ul1 = document.getElementById("ul1");

     // ul1.onclick = function(e){

     //     var events = e || event;

     //     var target = e.target || e.srcElement;

     //     console.log(events.target.nodeName)

     // }

     $('#ul1').on('click','li',function(){

         $(this).css('background','red')

     })

 </script>

 </html>

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