原生ajax请求

var req = createXMLHTTPRequest();
if(req){
var url=SSlocalhostPaht + "/api/getInterfacePackageList?" + new Date().getTime();
req.open("POST", url, true);
req.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=utf-8;");
req.send();
req.onreadystatechange = function(){
if(req.readyState == 4){
if(req.status == 200){
var data = eval('('+req.responseText+')');

}else{
}
}
};
}