php_ajax实现登录

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function postRequest(strURL){
var xmlHttp;
if(window.XMLHttpRequest){
  var xmlHttp = new XMLHttpRequest();
}
else if(window.ActiveXObject){
  var xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlHttp.open('GET', strURL, true);
xmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
xmlHttp.onreadystatechange = function(){
  if (xmlHttp.readyState == 4){
   updatepage(xmlHttp.responseText);
  }
}
xmlHttp.send(null);
}
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);
return false;
}






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