数组自定义排序，判断对象是否为空！

package {
import flash.display.Sprite;

public class MMT extends Sprite
{
public function MMT()
{
var arr:Array = new Array();
arr.push({username:"V","userrank":1,usermoney:100});
arr.push({username:"V","userrank":4,usermoney:100});
arr.push({username:"V","userrank":2,usermoney:100});
traceArray(arr);
trace("----------");
arr.sortOn("userrank",Array.DESCENDING);
traceArray(arr);

var flag = true;
if(flag)
{
trace(flag);
}
flag = false;
if(flag)
{
trace(flag);
}
var obj:Object = new Object();
if(obj)
{
trace("obj : " + obj);
}
var obj2:Object;
if(obj2)
{
trace("obj2 : " + obj2);
}
}

private function traceArray(arr:Array):void
{
for(var i:uint = 0;i < arr.length;i++)
{
trace(arr[i].userrank);
}
}
}
}

1
4
2
----------
4
2
1
true
obj : [object Object]
[SWF] G:/work2/MMT/bin-debug/MMT.swf - 1,630 bytes after decompression