深度排序 （Y优先）

转载http://xiazhihui321.blog.163.com/blog/static/813288932011724113134882/

import flash.display.MovieClip;

var list:Array=[];

for(var i:int=0;i<100;i++){
 var mc:Test=new Test();
 mc.x=Math.random()*stage.stageWidth;
 mc.y=Math.random()*stage.stageHeight;
 this.addChild(mc);
 list.push(mc);
}
trace(getTimer());
list.sort(onSort);
function onSort(a:MovieClip,b:MovieClip){
 if(a.y>b.y){
  if(this.getChildIndex(a)<this.getChildIndex(b)){
   this.swapChildren(a,b);
  }
  return 1;
 }else if(a.y==b.y){
  if(a.x>b.x){
   if(this.getChildIndex(a)<this.getChildIndex(b)){
    this.swapChildren(a,b);
   }
   return 1;
  }
 }else{
  if(this.getChildIndex(a)>this.getChildIndex(b)){
   this.swapChildren(a,b);
  }
  return -1;
 }
}
trace(getTimer());

输出：

//15
//18