先确定模型，再使用ENTER_FRAME

package {import flash.display.Sprite;import flash.events.Event;public class Wave2 extends Sprite{private var angle:Number = 0;private var centerY:Number = 200;private var range:Number = 50;private var xspeed:Number = 1;private var yspeed:Number = .05;private var xpos:Number;private var ypos:Number;public function Wave2(){// constructor codeinit();}public function init():void{xpos = 0;graphics.lineStyle(1,0,1);graphics.moveTo(0,centerY);addEventListener(Event.ENTER_FRAME,onEnterFrame);}public function onEnterFrame(event:Event):void{xpos +=  xspeed;angle +=  yspeed;ypos = centerY + Math.sin(angle) * range;graphics.lineTo(xpos,ypos);}}}