定义按钮的热键
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>使用热键</title>
</head>
<body>
<form action="http://www.google.com" method="get" name="form1">
<textarea rows=5 cols=50></textarea>
<br><input type="submit" accessKey="S" value="提交(Alt+s)">
</form>
</body>
</html>