flash9复制效果《二》水泡

H2O类：

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package {
import flash.display.*;
import flash.events.*;

public class H2O extends MovieClip {
  var speedx = 0;
  var speedy = 0;
  public function H2O() {
   speedx = .5*Math.random()-0.5;
   speedy = 5*Math.random();
   this.addEventListener(Event.ENTER_FRAME, Mot);
  }
  function Mot(e:Event) {
   this.x +=speedx;
   this.y -=speedy;
   if (this.y<0) {
    init();
   }
  }
  function init() {
   this.y=400;
   this.x=Math.random()*550;
  }
}
}

flash9内代码：

function DisplayCircles()
{
for (var i:int = 0; i <100; i++)
{
var h2o:H2O = new H2O();
this.addChild(h2o);
h2o.x = Math.random()*500;
h2o.y =Math.random()*300+400;
h2o.alpha = .2+Math.random()*.5;

var scale:Number = .3+Math.random();
h2o.scaleX = h2o.scaleY = scale;
}
}
DisplayCircles();

补充：flash教程,As3.0