如何用php和ajax结合实现登录

用ajax和php结合实现登录注册 <script language="javascript">
function getXMLHTTPRequest()
{
var xRequest=null;
if (window.XMLHttpRequest)
{
xRequest=new XMLHttpRequest();
}
else if (typeof ActiveXObject != "undefined")
{
xRequest=new ActiveXObject("Microsoft.XMLHTTP");
}
return xRequest;
}
function Ajax(url)
{
AjaxObj = getXMLHTTPRequest();
AjaxObj.onreadystatechange = processRequest;
AjaxObj.open("post",url,true);
AjaxObj.setRequestHeader('Content-type','application/x-www-form-urlencoded');
AjaxObj.send("name"+name);

}
function processRequest()
{

if(AjaxObj.readyState == 4)
{
if(AjaxObj.status == 200)
{
if(AjaxObj.responseText != "")
{
document.getElementById("show").innerHTML="";
//alert(AjaxObj.responseText);

document.getElementById("show").innerHTML=AjaxObj.responseText;

}
}
else
{
alert("您所请求的页面有异常。")
}
}
else
{
document.getElementById("show").innerHTML="Loading......";
}
}
</script>
这是我在项目中用到的..
用onclick="Ajax(***.php)";调用就行..
这估计不能完全试用你的项目..思路是这样的.