$.ajax为何自定义的options无法传进去给回调？

//单击执行AJAX请求操作
function clickSubmit(sendUrl, data, _sucmsg, _errmsg){
	$.ajax({
		type: "POST",
		url: sendUrl,
		dataType: "json",
		timeout: 20000,
		data: data,
		sucmsg: _sucmsg,		//????????????????????????
		errmsg: _errmsg,          //????????????????????????
		success: function(data, textStatus) {
			if (data.status == 1){
				$.dialog.tips(this.sucmsg ? this.sucmsg : data.msg, 2, "32X32/succ.png", function(){
					//location.reload();
			    });
			} else {
				$.dialog.alert(this.errmsg ? this.errmsg : data.msg);
			}
		},
		error: function (XMLHttpRequest, textStatus, errorThrown) {
			$.dialog.alert("状态：" + textStatus + "；出错提示：" + errorThrown);
		}
	});
}