简单示例：
var midPos:Point = new Point(startPos.x+150,startPos.y-100);
var endPos:Point = new Point(Laya.stage.width/2,Laya.stage.height/2);
var c: Tween = Tween.to(_UI.firstImg, {"scaleX":0.2,"scaleY":0.2,"x": midPos.x}, 1000, Ease.circInOut , Handler.create(this, function ():void {
Tween.clear(c);
var d: Tween = Tween.to(_UI.firstImg, {"scaleX":1.36,"scaleY":1.5,"y":endPos.y }, 1000, null , Handler.create(this, function ():void {
Tween.clear(d);
}));
}));
