as3数组随机排序

import flash.events.MouseEvent;
import flash.ui.Mouse;

function randomsort(a, b) 
{ 
    return Math.random()>.5 ? -1 : 1; 
} 
var arr = [1, 2, 3, 4, 5,6,7,8,9]; 
arr.sort(randomsort); 
trace(arr); //traces 4,3,1,5,
mc.addEventListener(MouseEvent.CLICK,fn);
function fn (e:MouseEvent):void{
    trace(arr.sort(randomsort))
}