表单里用户名和密码两个属性，单击按钮触发AJAX函数，这个AJAX函数提取表单中“用户名”和“密码”的值发送到后台程序验证，php写的后台程序，php程序分别对“用户名”和“密码”进行验证，用户名出错给出提示，传回给ajax，显示到<div id="user"></div>中，同理密码出错，显示到<div id="pass"></div>中，现在用户名和密码能够正确传到PHP程序中，做出正确验证，但是xmlHttp.responseText，如何能实现上面的效果呀？急！！！
调试欢乐多
var xmlHttp;
function S_xmlhttprequest(){
if(window.ActivXObject){
xmlHttp=new ActiveXObject('Mcrosoft.XMLHTTP');
}else if(window.XMLHttpRequest){
xmlHttp=new XMLHttpRequest;
}
}
function php100(){
S_xmlhttprequest();
user=document.myform.user.value;
pwd=document.myform.pwd.value;
var postStr = 'user='+ user+'&pwd='+pwd; xmlHttp.open('POST','login3.php',true);
//定义传输的文件HTTP头信息
xmlHttp.onreadystatechange=byphp;
xmlHttp.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
//发送POST数据
xmlHttp.send(postStr); }
function byphp(){
var byphp100=xmlHttp.responseText;
document.getElementById('userInfo').innerHTML=byphp100;
}// JavaScript Document// JavaScript Documentform name="myform" method="post" action="">
用户名：<input type="text" name="user" value="" size=10;/> <br>
密 码：<input type="password" name="pwd" value="" size=10;/> <br>
<input type="button" name="button" value="登陆" onclick="php100();"/>
</form>
<div id="userInfo"></div>
<div id="passInfo"></div><?php
$username=$_POST['user']; //获取用户编号
$password=$_POST['pwd']; //获取密码编号
if($username=='09430102'){
echo "用户名正确";
}else{
echo "用户名不正确";
}
if($password=='my0917'){
echo "密码正确";
}else{
echo "密码错误";
}
?>
document.getElementById('userInfo').innerHTML=byphp100;这不是回传处理了吗？
var byphp100=xmlHttp.responseText;
if(/用户/.test(byphp100))
document.getElementById('userInfo').innerHTML=byphp100;
else
document.getElementById('passInfo').innerHTML=byphp100;
}
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<script src="ajax.js"></script>
<body>
<label>
用户名：<input type="text" id="username" name="textfield" />
</label>
<p>
密码 <input type="text" id="pw" name="textfield2" onblur="check()"/>
</p>
</body>
</html>
<div id="user"></div>
ajax.js
var http_request;
function send_request(url,method) {
http_request = false;
if(window.XMLHttpRequest) {
http_request = new XMLHttpRequest();
if (http_request.overrideMimeType) {
http_request.overrideMimeType('text/xml');
}
}
else if (window.ActiveXObject) {
try {
http_request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
http_request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {}
}
}
if (!http_request) {
window.alert("不能创建XMLHttpRequest对象实例.");
return false;
}
switch(method){
case 1:http_request.onreadystatechange = chk;break;
}
http_request.open("GET", url, true);
http_request.send(null);
}function check(){
send_request("check.php?action="+document.getElementById('pw').value,1);
function chk() {
if (http_request.readyState == 4) {
if (http_request.status == 200) {
document.getElementById("user").innerHTML="";
document.getElementById("user").value=http_request.responseText;
} else {
alert("您所请求的页面异常。");
}
}else {
document.getElementById("user").innerHTML="正在读取数据中……";
}
}
check.php<?phpif(存在){
echo"正确";
}else{
echo "不正确";
}
?>