Array.splice返回值是数组

import flash.display.MovieClip;

import flash.display.DisplayObject;

var m:MovieClip = new MovieClip();

var a:Array = [m];

var o:DisplayObject = a.splice(0, 1) as DisplayObject;

trace(o) //这样为何会输出null呢

原来Array.splice返回值是数组。。

var o:DisplayObject = a.splice(0, 1)[0] as DisplayObject;

trace(o) 这样就没问题了