<head>
<script type="text/javascript">
function validate()
{
var ok=true,un,pw1,pw2,el,ch0
var r = /^([0-9A-Za-z\-_\.]+)@([0-9a-z]+\.[a-z]{2,3}(\.[a-z]{2})?)$/g
if(""==(un=document.f.user.value))
{
alert("用户名不能为空！")
document.f.user.focus()
ok=false
}
else if(""==(pw1=document.f.password1.value))
{
alert("密码不能为空！")
document.f.password1.focus()
ok=false
}
else if(""==(pw2=document.f.password2.value))
{
alert("重复密码不能为空！")
document.f.password2.focus()
ok=false
}
else if(""==(el=document.f.email.value))
{
alert("邮箱不能为空！")
document.f.email.focus()
ok=false
}
if(ok)
{
if(!(un.length>=6 &&un.length<=20))
{
alert("用户名长度必须大于等于6小于等于20！")
document.f.user.focus()
ok=false
}
else
{
ch0=un.charAt(0).toLowerCase()
if(!(ch0>="a" &&ch0<="z"))
{
alert("用户名必须以字母开头！")
document.f.user.focus()
ok=false
}
else if(pw1!=pw2)
{
alert("重复密码与密码必须相同！")
document.f.password2.focus()
ok=false
}
else if(!r.test(el))
{
alert("不是有效的邮箱地址！")
document.f.email.focus()
ok=false
}
}
}
if(ok)
{
alert("恭喜你，通过了有效性验证！")
}
}
</script>
</head>
<body>
<form name="f">
用户名：<input type="text" name="user" /><br /><br />
密码：<input type="text" name="password1" /><br /><br />
重复密码：<input type="text" name="password2" /><br /><br />
邮箱：<input type="text" name="email" /><br /><br />
<input type="button" value="验证" onclick="validate()" />
</form>
</body>
</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML>
<HEAD>
<TITLE>New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<BODY>
<table width="500" border="0" align="center" cellpadding="4" cellspacing="1" bgcolor="#CCCCCC">
<form name="form" method="post" >
<tr bgcolor="#f9f9f9">
<td width="13%" height="20" ><div align="right">姓名：</div></td>
<td width="53%" height="20"><input type="text" name="name" id="name" class="write" size="20" maxLength=8>
*8个字内</td>
<script>
function showimage(){document.images.showimages.src="<%=imdeximg%>"+document.form.sex.options[document.form.sex.selectedIndex].value+""+document.form.img.options[document.form.img.selectedIndex].value+".gif"}
</script>
</tr>
<tr bgcolor="#f9f9f9">
<td height="20" align="right">性别： </td>
<td height="20"><select name="sex" size="1" onChange="showimage()">
<option value="1">男</option>
<option value="0">女</option>
</select></td>
</tr>
<tr bgcolor="#f9f9f9">
<td height="20" align="right">QQ：</td>
<td height="20"><input name="qq" type="text" id="qq" size="35" maxLength=15 class="write">
*</td>
</tr>
<tr bgcolor="#f9f9f9">
<td height="20" align="right">主页： </td>
<td height="20"><input name="web" type="text" value="http://" size="35" maxLength=50 class="write">
</td>
</tr>
<tr bgcolor="#f9f9f9">
<td height="20" align="right">来自：</td>
<td height="20"><input name="come" type="text" id="come" size="35" class="write"></td>
</tr>
<tr bgcolor="#f9f9f9">
<td height="20" align="right">电子邮箱：</td>
<td height="20"><input name="email" type="text" value="" size="35" maxlength=50 class="write">
*</td>
</tr>
<tr bgcolor="#f9f9f9">
<td height="20" align="right">主题：</td>
<td height="20">
<input name="title" type="text" class="write" id="title" size="35" maxLength=10>
*
</td>
</tr>
<tr bgcolor="#f9f9f9">
<td align="right" valign="top">留言内容： </td>
<td><textarea name="words" cols="50" rows="8" class="input1" id="words"
onKeyDown=gbcount(this.form.words,this.form.total,this.form.used,this.form.remain)
onKeyUp=gbcount(this.form.words,this.form.total,this.form.used,this.form.remain)></textarea>
* </td>
</tr>
<tr bgcolor="#f9f9f9">
<td align="right" valign="top" height="30"></td>
<td height="30">最多字数： <INPUT disabled maxLength=4 name=total size=3 value=<%=txt%>>
已用字数：
<INPUT disabled maxLength=4 name=used size=3 value=0>
剩余字数：
<INPUT disabled maxLength=4 name=remain size=3 value=<%=txt%>></td>
</tr>
<tr align="center" bgcolor="#EAEAEA">
<td height="20" colspan="2"> <input name='validatecode' type='text' size='5'><img
src='/validatecode.asp' align='absmiddle' border='0'><br>
<br>
<input type="hidden" name="action_e" value="Add_New">
<input type="button" onclick="DoSave()" name="Submit" value=" 提 交 " class="input1"><input type="reset" name="Submit2" value=" 重 写 " class="input1">
</td></tr>
</form>
</table>
<SCRIPT LANGUAGE="JavaScript">
<!--
function checkForm(){
var name = document.getElementById('name')
if(name.value == ''){
alert("姓名不能为空")
return false
}
return true
}
function DoSave(){
if(checkForm()){
document.form.action = "<%=indexfilename%>"
document.form.submit()
}
}
//-->
</SCRIPT>
</BODY>
</HTML>
给你写了一个,就是姓名不能空,如果其它的也要做这个判断的话,你再把其它的都加上,如果不清楚,用百度hi我
