请老师检查代码

来源：4-8 编程练习

xcn_aaaa

2022-07-11 15:35:52

<!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>
</head>
<body>
    <input type="button" value="点击我试试" class="btn">
    <script>
        var btn = document.querySelector('.btn');
        btn.onclick = function(){
            this.style.backgroundColor = 'green';
        }
    </script>
</body>
</html>

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