今天的练习我只把页面写出来了，剩下的三点我实在是想不出来了，救救我救救我救救我[face]emoji

今天的练习我只把页面写出来了，剩下的三点我实在是想不出来了，救救我救救我救救我[face]emoji:010.png[/face][face]emoji:010.png[/face][face]emoji:010.png[/face]
<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" href="">
    <script src=""></script>
</head>
<style>
    * {
        margin: 0;
        padding: 0;
    }
    
    li {
        list-style: none;
    }
    
    .box {
        width: 300px;
    }
    
    .box li {
        width: 25%;
        height: 30px;
        text-align: center;
        line-height: 30px;
        float: left;
        background-color: #6A8E24;
        color: #fff;
    }
    
    .box li:hover {
        background-color: #7F7F02;
    }
    
    div {
        width: 300px;
        height: 300px;
        color: #fff;
        line-height: 300px;
        font-size: 30px;
        display: none;
        text-align: center;
        background-color: #7F7F02;
    }
    
    .div1 {
        display: block;
    }
</style>

<body>
    <ul class="box">
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
    </ul>
    <div>内容1</div>
    <div>内容2</div>
    <div>内容3</div>
    <div>内容4</div>
</body>
<script>
    var lis = document.querySelectorAll('li');
    var divs = document.querySelectorAll('div')
    for (let i = 0; i < 4; i++) {
        lis[i].onmouseover = function() {
            for (m = 0; m < 4; m++) {
                divs[m].className = '';
            }
            divs[i].className = 'div1'
        }
    }
</script>

</html>