1. function _post(url,data,cb){
    2.         var xmlHttp,
    3.             isIE = false;
    5.         if(window.ActiveXObject){
    6.             // xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
    7.             xmlHttp = new XDomainRequest();
    8.             isIE = true;
    9.         }else{
    10.             xmlHttp = new XMLHttpRequest();
    11.         }
    13.         xmlHttp.onreadystatechange = function (){
    14.             if(xmlHttp.readyState == 4) {
    15.                 if(xmlHttp.status == 200) {
    16.                     cb && cb(responseText);
    17.                 }
    18.             }
    19.         };
    21.         xmlHttp.open("POST", url);
    22.         xmlHttp.withCredentials = true;
    23.         if(isIE){
    24.             xmlHttp.contentType = 'application/json'
    25.         }else{
    26.             xmlHttp.setRequestHeader('Content-Type','application/json');
    28.         }
    30.         xmlHttp.send(JSON.stringify(data));
    32.     }