<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<center>
<form>
name<input type="text" id='name'/>
<br />
key <input type="text" id='key'/>
<br />
<br />
<input type="button" value="submit" id='sub' onclick="check()"/>
<input type="reset" value="clear" id='clr'/>
</form>
</center>
<script type="text/javascript">
var name=document.getElementById('name');
var key=document.getElementById('key');
function check(){
if (name.value==""){
alert("please input your name!");
}
if (key.value==""){
alert("input your key!");
}
}
</script>
</body>
</html>
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