[]移动Sprite时，边缘闪烁

var lastTimestamp = 0; var count = 0; var totale = 0;

        Laya.timer.frameLoop(1, this, function test() {

            var deltaTime = new Date().getTime() - lastTimestamp;

            lastTimestamp = new Date().getTime();

            count++;

            totale += deltaTime;

            this.x += this.speed_x*deltaTime;

            this.y += this.speed_y*deltaTime;

        });

var Tank = (function () {

    function tankSprite() {

        this.speed_x = 3;

        this.speed_y = 4;



        this.graphics.drawRect(0, 0, 90, 90, '#aabbcc', '#bbccdd', 1);

        Laya.stage.addChild(this);



        var lastTimestamp = 0; var count = 0; var totale = 0;

        Laya.timer.frameLoop(1, this, function test() {

            var deltaTime = new Date().getTime() - lastTimestamp;

            lastTimestamp = new Date().getTime();

            count++;

            totale += deltaTime;

            this.x += this.speed_x*deltaTime;

            this.y += this.speed_y*deltaTime;

        })

    }

    Laya.class(tankSprite, "Tank", laya.display.Sprite);//Laya.Sprite);

    return tankSprite;

}());