function ajax(url,fnsucc,fnFaild){

    if(window.XMLHttpRequest){

                var oAjax = new XMLHttpRequest();

            }

            else{

                var oAjax = new ActiveXObject("Microsoft.XMLHTTP");

            }

            //alert(oAjax);

            //2.连接到服务器；

            //open(方法,文件名，异步同步传输)

            oAjax.open('get',url+"?date="+new Date().getTime(),true);

            //3.发送请求；

            oAjax.send();

            //4.接收返回；

            oAjax.onreadystatechange = function(){

                if(oAjax.readyState==4){

                    if(oAjax.status==200){

                        fnsucc(oAjax.responseText);

                    }

                    else{

                        if(fnFaild){

                            fnFaild(oAjax.status);

                        }

                    }

                }

            }

}