缓动 减速运动

import flash.events.Event;

var easing:Number=0.2;／／比例系数

var targetX:Number=500;

var targetY:Number=0;

var dx:Number;

var dy:Number;

var vx:Number;

var vy:Number;

this.addEventListener(Event.ENTER_FRAME,moveing);

function moveing(e:Event):void{

vx=(targetX-ball.x)*easing;

vy=(targetY-ball.y)*easing;

ball.x+=vx;

ball.y+=vy;

}