ajax修改密码

<div>用户名：<input type="text" id="uid" /><span id="tt" style="display:none">用户名不存在</span></div>

<div>密&nbsp;码：<input type='password' id='pwd' /><span id="ts" style="display:none">密码不正确</span></div>
<div>新密码：<input type="password" id="pod" /><span id="ta" style="display:none">新密码不能为空</span></div>
<div>新密码：<input type="password" id="ppd" /><span id="tb" style="display:none">第二次新密码不能为空</span></div>
<div ><input type="button" value="修改" id="btn" />&nbsp;<a href="dengluzhu.php"><input type="submit" value="返回" /></a></div>

</div>
</div>

<script type="text/javascript">
$(document).ready(function(e){
$("#uid").blur(function(){
    var uid = $("#uid").val()
    $.ajax({
        url:"uidchuli.php",
        data:{uid:uid},
        dataType:"TEXT",
        type:"POST",
        success: function(data){
            //alert(data);
            if(data.trim()==)
    {

        $("#tt").css("display","block");
        return false;
    }
    else if(data.trim()==)
    {
        $("#tt").css("display","none");

    }
    }
    })
    })
    })
$("#pwd").blur(function(){
    var uid = $("#uid").val();
    var  pwd = $("#pwd").val();
    $.ajax({
        url:"uidpwdchuli.php",
        data:{pwd:pwd,uid:uid},
        type:"POST",
        dataType:"TEXT",
        success: function(data){

            if(data.trim()=="no")
    {
        $("#ts").css("display","block");
        return false;
    }
            if(data.trim()=="ok")
    {
        $("#ts").css("display","none");

    }
    }
    })
    })
$("#pod").blur(function(){
    var pod = $("#pod").val();
    if(pod.trim().length==)
    {

    $("#ta").css("display","block");
    return false;
    }
    else
    {

    $("#ta").css("display","none")
    }
    })
    $("#ppd").blur(function(){
        var ppd = $("#ppd").val();
        if(ppd.trim().length==)
    {

    $("#tb").css("display","block");
    return false;
    }
    else
    {

    $("#tb").css("display","none")
    }
    })

$("#btn").click(function(){
    var uid = $("#uid").val();
    var pod = $("#pod").val();
    var ppd = $("#ppd").val();

    if(pod.trim().length!=ppd.trim().length)
    {
    alert("输入的两次密码不相同");
    return false;
    }

    else
    {
    $.ajax({
        url:"xugaichuli.php",
        data:{uid:uid,pod:pod,ppd:ppd},
        dataType:"TEXT",
        type:"POST",
        success: function(data){
        if(data.trim().length==)
        {
            alert("修改成功");

        }
        }
        })
    }

    });
</script>

//ajax修改主页

<?php

$uid=$_POST["uid"];

include("js/DBDA.class.php");

$db=new DBDA();
$sql="select count(*) from admin where adminname='{$uid}'";

echo $db->StrQuery($sql);

?>

//uid处理页面

<?php

$uid=$_POST["uid"];
$pwd=$_POST["pwd"];
include("js/DBDA.class.php");

$db=new DBDA();
$sql="select password from admin where adminname='{$uid}'";

 $mm=$db->StrQuery($sql);
if($mm==$pwd && $pwd!="")
{

    echo "ok";    

}
else
{
echo "no";    

}

//判断密码处理页面

<?php

$uid=$_POST["uid"];
$pod=$_POST["pod"];
include("js/DBDA.class.php");
$db=new DBDA();

$sql="update admin set password='{$pod}' where adminname='{$uid}'";

echo $db->StrQuery($sql,);

?>

//执行修改处理页面