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简单示例：AJAX结合PHP代码实现登录
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javascript:tagshow(event, 'HTML');" href="javascript:;" target=_self>HTML部分：
<html>
<head>
<scrīpt language="javascrīpt">
function postRequest(strURL){
var xmlHttp;
if(window.XMLHttpRequest){ // For Mozilla, Safari, ...
var xmlHttp = new XMLHttpRequest();
}
else if(window.ActiveXObject){ // For Internet Explorer
var xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlHttp.open('POST', strURL, true);
xmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
xmlHttp.onreadystatechange = function(){
if (xmlHttp.readyState == 4){
updatepage(xmlHttp.responseText);
}
}
xmlHttp.send(strURL);
}
function updatepage(str){
if(str=="yes"){
alert("Welcome User");
}else{
alert("Invalid Login! Please try again!");
}
}
function call_login(){
var username = window.document.f1.username.value;
var password = window.document.f1.password.value;
var url = "login.php?username=" + username + "&password=" +password ;
postRequest(url);
}
</scrīpt>
</head>
<body>
<Center>
<form name="f1" ōnSubmit="return call_login();">
<table border="0" bgcolor="#CCCCCC" cellspacing="1" cellpadding="3" width="316">
<tr>
<td align="left" colspan="2"><b><font size="5" color="#000080">Login</font></b></td>
</tr>
<tr>
<td align="right" width="124"><b><font color="#000080">User
Name:</font></b></td>
<td width="177"><input type="text" name="username" id="user" size="20" value="" /></td>
</tr>
<tr>
<td align="right" width="124"><b><font color="#000080">Password:</font></b></td>
<td width="177"><input type="password" name="password" size="20" value="" /></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="button" name="a1" value="Login" ōnClick="call_login()"></td>
</tr>
</table>
</form>
</center>
</body>
</html>
PHP脚本部分login.php：
<?
$username=$_GET["username"];
$password=$_GET["password"];
if($username=="admin" && $password=="admin"){
echo "yes";
}else{
echo "No";
}
?>
<html>
<head>
<scrīpt language="javascrīpt">
function postRequest(strURL){
var xmlHttp;
if(window.XMLHttpRequest){ // For Mozilla, Safari, ...
var xmlHttp = new XMLHttpRequest();
}
else if(window.ActiveXObject){ // For Internet Explorer
var xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlHttp.open('POST', strURL, true);
xmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
xmlHttp.onreadystatechange = function(){
if (xmlHttp.readyState == 4){
updatepage(xmlHttp.responseText);
}
}
xmlHttp.send(strURL);
}
function updatepage(str){
if(str=="yes"){
alert("Welcome User");
}else{
alert("Invalid Login! Please try again!");
}
}
function call_login(){
var username = window.document.f1.username.value;
var password = window.document.f1.password.value;
var url = "login.php?username=" + username + "&password=" +password ;
postRequest(url);
}
</scrīpt>
</head>
<body>
<Center>
<form name="f1" ōnSubmit="return call_login();">
<table border="0" bgcolor="#CCCCCC" cellspacing="1" cellpadding="3" width="316">
<tr>
<td align="left" colspan="2"><b><font size="5" color="#000080">Login</font></b></td>
</tr>
<tr>
<td align="right" width="124"><b><font color="#000080">User
Name:</font></b></td>
<td width="177"><input type="text" name="username" id="user" size="20" value="" /></td>
</tr>
<tr>
<td align="right" width="124"><b><font color="#000080">Password:</font></b></td>
<td width="177"><input type="password" name="password" size="20" value="" /></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="button" name="a1" value="Login" ōnClick="call_login()"></td>
</tr>
</table>
</form>
</center>
</body>
</html>
PHP脚本部分login.php：
<?
$username=$_GET["username"];
$password=$_GET["password"];
if($username=="admin" && $password=="admin"){
echo "yes";
}else{
echo "No";
}
?>