浏览器端

<script type="text/javascript">

  

$('#submit').click(function(){

$email  = $('#retake_psd_email').val();

$url    = "/user/get_user_id?email="+$email+"&jsoncallback=?";

$.getJSON( $url, function(data){

    if ( data.error == 1 )

        alert_error( 'email 格式错误');

    else if ( data.error == 2 )

        alert_error( '用户不存在');

    else if ( data.error == 0)

    {

          

        $('#value').text( data.user );

    }

  

});

  

  

  

});

　服务器端

<?php

   

   

   

   

$callback    = $_GET['jsoncallback'];

$email         = $_GET['email'];

   

   

echo "$callback({error:0,user:$email})";

var $button_html    ='<input type="button" ';

var $button_html2   = ' value="下一步" />';

      

        

$(function(){

       

                

                

    $('#retake_psd').click(function() {

        var username = $('#retake_psd_email').val();

        var coolgw_captcha = $('#captcha').val();

        if(username == "" || !username.match(_reg_email_)) {

            alert_error("E-mail格式错误");

            return;

        }

        if ( coolgw_captcha.length != 7 ) {

            alert_error( "验证码错误" );

            return;

        }

        $.ajax({

            type:'POST',

            url:base_url+'retakepajax',

            data:"email="+username + "&captcha="+coolgw_captcha,

            success:function(msg) {

                msg     = eval("("+msg+")");

                if ( msg.num == 0 )

                    alertor( 'E-mail格式错误' );

                else if ( msg.num == 1 )

                    alertor( '用户不存在' );

                else if ( msg.num == 2 )

                    alertor( '用户未设置密保' );

                else if ( msg.num == 4 )

                    alertor( '验证码错误' );

                else if ( msg.num == 3 )

                {

                    var $html   = '';

                    $(msg.msg).each(function(i,msg){

                        $html   += "<h3>" + msg.question + "</h3>"

                                +  '<input type="text" style="height:28px; width:263px;" class="user_answer"><br />'

                                +' <input type="hidden" class="user_question_id" value="'+msg.id+'"><br />';

                    });

                            

                    $html   += '<input type="hidden" id="user_id" value='+msg.email+'><br />';

                    $html   += $button_html + ' onClick="javascript:submit_answer()"' + $button_html2;

                            

                    $("#before_send").html($html);

                }

            }

        });

                

    });

});

function submit_answer()

{

    var $user_question_id   = $('.user_question_id');

    var $user_answer        = $('.user_answer');

    var question_id         = {};

    var $data               = '';

    var flug    = 1;

    $user_question_id.each(function(i,x){

        question_id[i] = $(x).val();

    });

    $user_answer.each(function(i,x){

        if ( $(x).val() == "" ) {

            alertor("请输入问题答案");

            flug    = 0;

        }

        $data +=  'user_answer['+question_id[i]+']=' + $(x).val()+'&';

    });

    if ( flug == 0 )

        return;

    $data   += 'email=' + $("#user_id").val();

        $.ajax({

            type:"POST",

            url:base_url+"retakswer",

            data:$data,

            success:function(msg){

                data    = eval("(" +msg+ ")");

                if ( data.num == 0 )

                    alertor( 'E-mail 错误' );

                else if ( data.num == 1 )

                    alertor( '回答错误' );

                else if ( data.num == 2 ) {

                    var $html   = '<h3>新的密码</h3><input type="password"  style="height:28px; width:263px;"  class="user_psd"><br/>'

                                +  "<h3>确认新的密码</h3>" + '<input type="password"  style="height:28px; width:263px;"  class="user_psd"><br />';

                            

                    $html   += '<input type="hidden" id="retakepsd_rand_str" value='+data.str+'><br />';

                    $html   += $button_html + ' onClick="javascript:submit_psd()" ' + $button_html2;

                            

                    $("#before_send").html($html);

                            

                            

                }

            }

        });

}

        

function subpsd()

{

    var $data   = '';

    $('.user_psd').each(function(i,x){

        $data   += "password[]="+$(x).val()+"&";

    });

            

    $data   += "rand_str=" + $("#retakepsd_rand_str").val();

    $.ajax({

        type:"POST",

        url:base_url+"retakge_psd",

        data:$data,

        success:function(msg) {

            data    = eval("("+msg+")");

            if ( data.num == 0 ) {

                alertor('请重新输入');

                setTimeout(function(){window.location.href=window.location.href},100);

            } else if ( data.num == 1 )

                alertor( data.msg );

            else if ( data.num == 2 ) {

                alertor('修改成功');

                setTimeout(function(){window.location.href=base_url},100);

            }

        }

    });

}

$.post(base_url+"login",{email:tmpusername,password:tmppwd},function(data) {

            var objJson = eval("("+data+")");

            if(objJson['code'] == 1) {

                alert("error!");

                return;

            }

            if(objJson['code'] == 0) {

                alert("bugs!");

                return;

            }

            if(objJson['code'] == 4) {

                location.href = base_url;

                return;

            }

                 

             

        });