[]js执行once时如何改变执行域

_proto.onMsgCallBack = function () {

        this.kwxSocket.OnMessageCallBack=function(msg){

            console.log("回调"+msg);

            var dataTemp = JSON.parse(msg);

            console.log(dataTemp.d);

            kwxGame.prototype.cardData = dataTemp.d;



            [b][i]Laya.timer.once(1000, this, this.onOncePiao);

[/i][/b]

        }

    }