js代码:
<script type="text/javascript" src="jquery-1.7.1.js">
</script><script type="text/javascript">
var yanzheng=function(){
if (CheckName())
{
return true;
}
return false;
}var CheckName=function (){if(username.val().length==0)
{
alert("用户名不能为空");
username.focus();
return false;
} if(!/^\w{3,8}$/.test(username.val()))
{
alert("用户名必须为3到8位(数字字母下划线)");
username.select();
return false;
}}; </script>
<script type="text/javascript" src="jquery-1.7.1.js">
</script><script type="text/javascript">
var yanzheng=function(){
if (CheckName())
{
return true;
}
return false;
}var CheckName=function (){if(username.val().length==0)
{
alert("用户名不能为空");
username.focus();
return false;
} if(!/^\w{3,8}$/.test(username.val()))
{
alert("用户名必须为3到8位(数字字母下划线)");
username.select();
return false;
}}; </script>
<body>
<div id="Layer1">
<div id="Layer2">
<form action="zhuce.action" id="form1" method="post" >
<table width="337" height="132" class="one" >
<tr>
<td width="69"><font id="yellow"> 用户名:</font></td>
<td width="252"><input type="text" id="username"/></td>
<td><font id="yellow"><s:property value="#request.r1"/><s:property value="#request.r2"/></font></td>
</tr>
<tr>
<td> </td>
<td><font id="red">用户名由字母或数字或下划线组成(3到8位)</font></td>
</tr>
<tr>
<td><font id="yellow"> 密码:</font></td>
<td><input type="password" name="password" id="password"/></td>
<td><font id="yellow"><s:property value="#request.r3"/><s:property value="#request.r4"/></font></td>
</tr>
<tr>
<td> </td>
<td><font id="red">密码(6到12位)</font></td>
</tr>
<tr>
<td><font id="yellow"> 密码确认 :</font></td>
<td><input type="password" name="p1" id="p1"/></td>
<td><font id="yellow"><s:property value="#request.r5"/><s:property value="#request.r6"/></font></td>
</tr>
<tr>
<td> </td>
<td><font id="red">必须与密码一致</font></td>
</tr>
<tr>
<td height="19" colspan="2" valign="middle">
<div align="center">
<input type="submit" value="注册" onClick="return yanzheng()"/></div>
</td>
</tr>
<tr>
<td colspan="2" class="tt"> <div align="center"> <input type="reset" value="重置"/></div> </td>
</tr>
</table>
</form>
<s:debug></s:debug>
</div>
</div>
</body>
这样呢?var username=$("#form1>input")[0];