所属分类:PHP实例-Ajax,常用实例教程
index.php
若用户为登录状态,则显示用户相关登录信息,否则显示登录表单。
<div id="login"> <h3>用户登录</h3> <?php if(isset($_SESSION['user'])){ ?> <div id="result"> <p><strong><?php echo $_SESSION['user'];?></strong>,恭喜您登录成功!</p> <p>您这是第<span><?php echo $_SESSION['login_counts'];?></span>次登录本站。</p> <p>上次登陆本站的时间是:<span><?php echo date('Y-m-d H:i:s',$_SESSION['login_time']);?> </span></p><p><a href='#' id='logout'>【退出】</a></p> </div> <?php }else{?> <div id="login_form"> <p><label>用户名:</label> <input type="text" class="input" name="user" id="user" /></p> <p><label>密 码:</label> <input type="password" class="input" name="pass" id="pass" /> </p> <div class="sub"> <input type="submit" class="btn" value="登 录" /> </div> </div> <?php }?> </div>
global.js登录
$(".btn").live('click',function(){ var user = $("#user").val(); var pass = $("#pass").val(); if(user==""){ $('<div id="msg" />').html("用户名不能为空!").appendTo('.sub').fadeOut(2000); $("#user").focus(); return false; } if(pass==""){ $('<div id="msg" />').html("密码不能为空!").appendTo('.sub').fadeOut(2000); $("#pass").focus(); return false; } $.ajax({ type: "POST", url: "ajax.php?action=login", dataType: "json", data: {"user":user,"pass":pass}, beforeSend: function(){ $('<div id="msg" />').addClass("loading").html("正在登录...").css("color","#999") .appendTo('.sub'); }, success: function(json){ if(json.success==1){ $("#login_form").remove(); var div = "<div id='result'><p><strong>"+json.user+"</strong>,恭喜您登录成功!</p> <p>您这是第<span>"+json.login_counts+"</span>次登录本站。</p> <p>上次登录本站的时间是:<span>"+json.login_time+"</span></p><p> <a href='#' id='logout'>【退出】</a></p></div>"; $("#login").append(div); }else{ $("#msg").remove(); $('<div id="errmsg" />').html(json.msg).css("color","#999").appendTo('.sub') .fadeOut(2000); return false; } } }); });
global.js退出
$("#logout").live('click',function(){ $.post("ajax.php?action=logout",function(msg){ if(msg==1){ $("#result").remove(); var div = "<div id='login_form'><p><label>用户名:</label> <input type='text' class='input' name='user' id='user' /></p> <p><label>密 码:</label> <input type='password' class='input' name='pass' id='pass' /></p> <div class='sub'><input type='submit' class='btn' value='登 录' /></div> </div>"; $("#login").append(div); } }); });
ajax.php
用户登录和退出后端PHP操作如下:
session_start(); require_once ('connect.php'); $action = $_GET['action']; if ($action == 'login') { //登录 $user = stripslashes(trim($_POST['user'])); $pass = stripslashes(trim($_POST['pass'])); if (empty ($user)) { echo '用户名不能为空'; exit; } if (empty ($pass)) { echo '密码不能为空'; exit; } $md5pass = md5($pass); //密码使用md5加密 $query = mysql_query("select * from user where username='$user'"); $us = is_array($row = mysql_fetch_array($query)); $ps = $us ? $md5pass == $row['password'] : FALSE; if ($ps) { $counts = $row['login_counts'] + 1; $_SESSION['user'] = $row['username']; $_SESSION['login_time'] = $row['login_time']; $_SESSION['login_counts'] = $counts; $ip = get_client_ip(); //获取登录IP $logintime = mktime(); $rs = mysql_query("update user set login_time='$logintime',login_ip='$ip', login_counts='$counts'"); if ($rs) { $arr['success'] = 1; $arr['msg'] = '登录成功!'; $arr['user'] = $_SESSION['user']; $arr['login_time'] = date('Y-m-d H:i:s',$_SESSION['login_time']); $arr['login_counts'] = $_SESSION['login_counts']; } else { $arr['success'] = 0; $arr['msg'] = '登录失败'; } } else { $arr['success'] = 0; $arr['msg'] = '用户名或密码错误!'; } echo json_encode($arr); //输出json数据 } elseif ($action == 'logout') { //退出 unset($_SESSION); session_destroy(); echo '1'; }