ASP要用JAVASCRIPT来验证

<script language="javascript">
function zhenshi_xingming_yanzheng()
{
if(form1.zhenshi_xingming.value.length<6||form1.zhenshi_xingming.value.length>16)
{
form1.zhenshi_xingming.focus();
form1.zhenshi_xingming.select();
alert("请输入6到16位的用户名");

return false;
}
else if(form1.zhenshi_xingming.value.charAt(0)=='-')
{ form1.zhenshi_xingming.focus();
form1.zhenshi_xingming.select();
alert("用户名不能以-开头");

return false;
}

}
</script> 

 

 

<form id="form1" name="form1" method="post" action="" onsubmit="return zhenshi_xingming_yanzheng()">