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/**
* Ajax²Ù×÷º¯Êý
*
* @param url -- ·þÎñÆ÷¶ËÒ³ÃæµØÖ·
* @param param -- ²ÎÊý£¬ÀàËÆ 'user=123&id=100'
* @param method -- ÇëÇó·þÎñÆ÷¶ËµÄ·½·¨,GetºÍPostÁ½ÖÖ£¬Ä¬ÈÏÊÇGET
* @param response -- ÊÇ·ñ»ñÈ¡·þÎñÆ÷¶Ë·µ»ØµÄ½á¹û£¬Ä¬ÈÏÊÇtrue
*/
function ajax( url, param, method, response ){
//set default value
param = typeof(param)=='undefined' ? '' : param;
method = typeof(method)=='undefined' ? 'GET' : method;
response = typeof(response)=='undefined' ? true : response;
//get ajax object
var ajax = null;
try {
   ajax = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
   try {
    ajax = new ActiveXObject("Microsoft.XMLHTTP");
   } catch (E) {
    ajax = null;
   }
}
if (!ajax && typeof XMLHttpRequest!='undefined'){
   ajax = new XMLHttpRequest();
}
if (!ajax){
   alert("Get ajax object failed");
   return false;
}
//send http request
var res = '';
if (method != 'GET'){
   method = 'POST';
}
if (method == 'GET'){
   ajax.open('GET', url + param, true);
   ajax.onreadystatechange = function(){
    if (ajax.readyState==4 && ajax.status==200){
     res = ajax.responseText;
    }
   }
   ajax.send(null);
}
if (method == "POST"){
   ajax.open("POST", url, true);
   ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
   ajax.send(param);
   ajax.onreadystatechange = function() {
    if (ajax.readyState==4 && ajax.status==200) {
     res = ajax.responseText;
    }
   }
}
if (response){
   return res;
}
return null;
}


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