下面这个javascript 函数是用来做无刷新判断用户名和密码是否正确

<script language= "javascript">

function login_sussess(){

    var flag = false;

 var user,psw;

 user = form1.user.value;

 psw =form1.psw.value;

 coder = form1.coder.value;

 form1.submit2.disabled ="false";

 document.getElementById("check_result_title").innerHTML ="正在登陆...";

 var oXMLDoc = new ActiveXObject(‘MSXML‘);//建立XML文档对象

 sURL = "js/login_go.php?user="+user+"&psw="+psw+"&coder="+coder//载入数据页面

 oXMLDoc.url = sURL; // 载入数据到对象url

 var oroot = oXMLDoc.root;//读取根节点

    oItem = oroot.children.item(0);

   //如果还要读取oItem的子节点,应该 oItem.children.tiem(i) 就可以,以此类推

 if (oItem.text == ‘1‘){

     document.getElementById("check_result_title").innerHTML = "用户名或密码不正确";

     form1.submit.disabled = "true";

  }else if(oItem.text == ‘2‘){

     document.getElementById("check_result_title").innerHTML = "验证码不正确";

     form1.submit.disabled = "true";

  }else if(oItem.text == ‘3‘){

         document.getElementById("check_result_title").innerHTML = "登陆成功,";

           location.href ="http://www.mamicode.com/index.php";

   }

}

</script>

下面这部分是login_go.php的源码:

<?php

require_once("../class/_conn.php");

if (isset($_REQUEST["user"])&&$_REQUEST["user"])  $user = trim($_REQUEST["user"]);

if (isset($_REQUEST["psw"])&&$_REQUEST["psw"])  $user = md5(trim($_REQUEST["psw"]));

if (isset($_REQUEST["coder"])&&$_REQUEST["coder"])  $coder = trim($_REQUEST["coder"]);

$flag = ‘1‘;

print("<?xml version=‘1.0‘ encoding=‘gb2312‘ ?>");

print("<plan>");

$result = $connection->My_query("select * from `members` where username = ‘$user‘ and password = ‘$psw‘",$connection->conn);

if ($row = $connection->My_array($result)){

    if ($_SESSION["code"] != $coder){

    $flag = ‘2‘;//验证码不正确

 }else{

    $flag = ‘3‘;//登陆成功

    }

}

$connection->My_mysql_close($result);

echo "<result>$flag</result>";

echo ‘</plan>‘;

?>

此段php输出的xml内容是:

  <?xml version="1.0" encoding="gb2312" ?>

<plan>

  <result>1</result>

  </plan>

javascript读取xm子节点,无刷新例子(javascript,xml,php)