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<HEAD>
<title>无标题文档</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<SCRIPT LANGUAGE="JavaScript">
function checkData()
{
if(document.getElementById('userid').value==""){
document.getElementById('errorMsg').innerHTML="<font color=red>用户名不能为空</font>";
return false;
}
return true;
}
</SCRIPT>
</HEAD>
<BODY>
<FORM action="" method="post" onsubmit="return checkData()">
<INPUT TYPE="text" name="user" id="userid" /><span id="errorMsg"></span><br>
<input type="submit" name="submit" value="Sub">
</FORM>
</BODY>
</HTML>