<html>
<body>
<form action="demo-form.php">
First name: <input type="text" name="fname" autofocus><br>
Last name: <input type="text" name="lname"><br>
<input type="submit">
</form>
<p><strong>注意：</strong> Internet Explorer 9及更早IE版本不支持input标签的 autofocus 属性。</p>
</body>
</html>