php+js+mysql设计的仿webQQ-登陆和注册

<6>登陆验证

Js代码

function checkLogin()
{       
var xmlhttp;
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
        xmlhttp=new XMLHttpRequest();
        if(xmlhttp.overrideMimeType)
    {//设置MIME类别
       xmlhttp.overrideMimeType("text/xml");
    }
  }
else
  {// code for IE6, IE5
        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
  var url="checkLogin.php?username="+document.getElementById("username").value+"&pwd="+document.getElementById("pwd").value;
//把用户名和密码传到checkLogin.php进行验证
  xmlhttp.open("GET",url,true);
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    { 
                document.getElementById("error5").innerHTML="<font color=red size=2px>"+xmlhttp.responseText+"</font>" ;
                if(xmlhttp.responseText=="登录成功")
                   {
                           window.location.href="myWebChat.php";   //验证成功后跳转到自己的主页
                           
                   }
    }
  } 

xmlhttp.send(null);
}

PHP代码

<?php
header('Content-Type:text/html;charset=GB2312');
include("conn.php");
$username=$_GET["username"];
$pwd=$_GET["pwd"];
if($username==null||$pwd==null)
   {
          echo "用户名或密码不能为空！";
   }
else
   {
         $sql="select * from user where email='$username'";
     $result = mysql_query($sql);
     $num=mysql_num_rows($result);
          if($num>0)
            {   
                        $row=mysql_fetch_array($result);
                        if($pwd==$row["pwd"])
                          {
                             @session_start();
                                 $_SESSION["email"]=$username;
                                 $statesql="update user set state='在线' where email='".$username."'";  //当用户成功登陆后把状态写入数据库
                                 mysql_query($statesql);
                                 echo "登录成功";
                          }
                        else
                          {
                             echo "用户名或密码错误！";
                          }
                }
          else
            {
                   echo "用户名或密码错误！";
                }       
   }
?>

<7>注册验证

Js代码

function checkRegistration()
{       
var xmlhttp;
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
        xmlhttp=new XMLHttpRequest();
        if(xmlhttp.overrideMimeType)
    {//设置MIME类别
       xmlhttp.overrideMimeType("text/xml");
    }
  }
else
  {// code for IE6, IE5
        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
  var url="checkRegistration.php?email="+document.getElementById("email").value+"&nickname="+document.getElementById("nickname").value+
           "&pwd="+document.getElementById("password2").value+"&sex="+document.getElementById("sex").value+
                   "&month="+document.getElementById("month").value+"&day="+document.getElementById("day").value+
                   "&error1="+document.getElementById("error1").innerHTML+"&error2="+document.getElementById("error2").innerHTML+
                   "&error3="+document.getElementById("error3").innerHTML+"&error4="+document.getElementById("error4").innerHTML;
  xmlhttp.open("GET",url,true);
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {  
           document.getElementById("error6").innerHTML="<font color=green size=2px>"+xmlhttp.responseText+"</font>";
           if(xmlhttp.responseText=="注册成功")
                   {
                           window.location.href="myWebChat.php";
                           
                   }
    }
  } 
xmlhttp.send(null);
}

PHP代码

<?php
header('Content-Type:text/html;charset=GB2312');
$error1=$_GET["error1"];
$error2=$_GET["error2"];
$error3=$_GET["error3"];
$error4=$_GET["error4"];
$error1=strlen($error1);
$error2=strlen($error2);
$error3=strlen($error3);
$error4=strlen($error4);
if(($error1==49&&$error2==49&&$error3==49&&$error4==53)||($error1==43&&$error2==43&&$error3==43&&$error4==47)) //仅适合IE和Chrome
  {     $email=$_GET["email"];
                $nickname=$_GET["nickname"];
                $pwd=$_GET["pwd"];
                $sex=$_GET["sex"];
                $month=$_GET["month"];
                $day=$_GET["day"];
                include("conn.php");
                $sql="insert into user values('$email','$pwd','$nickname','$sex','$month','$day','在线')";
                $result=mysql_query("$sql");
                if($result)
                  {
                      @session_start();
                          $_SESSION["email"]=$email;
                          echo "注册成功";
                  }
        
  }
else
  {
        echo "请完善注册信息!";
                                
  }
?>

注册验证自认为写的很差，欢迎拍砖！（未完待续）