jquery ajax event

function ajaxRequest(rurl, rdata) {
    $.ajax({
            url:rurl,
            type:"POST",
            dataType:"json",
            data:rdata,
            error:function (xml) {
               alert("\u7cfb\u7edf\u5f02\u5e38,\u8bf7\u7a0d\u540e\u518d\u8bd5!");
            },
        success:deleteSuccess,
        beforeSend:function(xml){
           alert('start')
        },
        complete:function(xml){
           alert('end')
        }
    }
);

}

beforeSend 发送之前
complete 不管是否成功,最后执行回调