老师,这样对吗?

来源：2-4 编程练习

慕言_7946275

2019-09-11 16:46:41

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>习题</title>
    <style type="text/css">
    div {
        width: 200px;
        height: 200px;
        border: 1px solid red;
        text-align: center;
        line-height: 200px;
    }
    </style>
</head>

<body>
    <div>背景颜色为白色</div>
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>    
    <script>
    //此处写代码
        $(document).ready(function(){
            $('div').mousedown(function(){
               $(this)
               .css({'background-color':'red'})
               .text('背景颜色为红色');
            });
        });
        
        $(document).ready(function(){
            $('div').mouseup(function(){
               $(this)
               .css({'background-color':'yellow'})
               .text('背景颜色为黄色');
            });
        });
    </script>
</body>
</html>

$(document).ready(function() 这个要不要加,好像其它同学都没加

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