1.方法一：
<!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>表单</title>
</head>
<body>
<form action="" style="display: grid;" method="POST">
<div>
<label for="username">账号：</label> <!-- 利用id进行绑定 -->
<input type="text" id="username">
</div>
</form>
</body>
</html>
方法二：
<!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>表单</title>
</head>
<body>
<form action="" style="display: grid;" method="POST">
<div>
<label>账号：<input type="text" > </label>
</div>
</form>
</body>
</html>
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