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第4期学习班-1.16作业-【javascript基础】
八七乱乱
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实例1.javascript基础

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>javascript基础</title>

</head>
<body>
<h2 id="header" style="color: blueviolet" onclick="alert(this.id)">草台班子学习频道</h2>
<h2 id="header" style="color: blueviolet" onclick="alert(id)">草台班子学习频道</h2>
<form action="">
    <input name="ban" type="text" value="草台班子">
    <button onclick="alert(ban.value)">显示内容</button>
    <br>
    <input name="username" type="text" placeholder="用户名">
    <button onclick="check(username)">验证表单</button>
    <script>
        function check(username) {
            if(username.value.length===0){
                alert('用户名空空如也')
            }else{
                alert('验证通过,您输入的内容是:'+username.value)
            }

        }
    </script>

</form>
</body>
</html>

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