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;
        });[/code]用以上代码移动一个继承Sprite的对象，边缘出现闪烁；请大家帮忙看看，谢谢
[code]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;
}());