AS3 TWEEN自带类

import fl.transitions.Tween;  
import fl.transitions.easing.*;  
import fl.transitions.TweenEvent;  
var homeX=300;
//var inTween = new Tween(main_mc,"alpha",None.easeNone,0,1,.5,true);  
var inTween = new Tween(main_mc,"x",Strong.easeInOut,main_mc.x,homeX,2,true);  
inTween.addEventListener(TweenEvent.MOTION_FINISH,MOTION_FINISH);  
inTween.addEventListener(TweenEvent.MOTION_START,MOTION_START);  

//开启可以 才能侦听到  MOTION_START时间
inTween.start();  
function MOTION_FINISH(e){
	trace("MOTION_FINISH");
}

function MOTION_START(e){
	trace("MOTION_START");
}