Javascript中事件对象的target和this的区别

39032021-04-09 13:59:51

Javascript中事件对象的target和this的区别

1、当触发对象与绑定对象一致时

<!DOCTYPE html>
<html>
<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>
</head>
<body>
    <ul>
        <li>item1</li>
        <li>item2</li>
        <li>item3</li>
        <li>item4</li>
        <li>item5</li>
    </ul>
    <script>
        const li=document.querySelector("ul li:nth-of-type(4)");
        console.log(li);
 
        li.addEventListener("click",function(e){
            console.log(e.target);
            console.log(this);
        });
    </script>
</body> 
</html>

点击item4这个li后，两者返回如下：

2、当触发对象与绑定对象不一致时

<!DOCTYPE html>
<html>
<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>
</head>
<body>
    <ul>
        <li>item1</li>
        <li>item2</li>
        <li>item3</li>
        <li>item4</li>
        <li>item5</li>
    </ul>
    <script>
        const ul=document.querySelector("ul");
        console.log(ul);
        ul.addEventListener("click",function(e){
            console.log(e.target);
            console.log(this);
        });
    </script>
</body> 
</html>

点击item4这个li后，输出如下：