[]有没有懂tiledmap地图的朋友帮忙看看问什么地图加载不出来

//代码如下
package {
import laya.display.Sprite;
import laya.display.Stage;
import laya.events.Event;
import laya.map.GridSprite;
import laya.map.MapLayer;
import laya.map.TileAniSprite;
import laya.map.TileTexSet;
import laya.map.TiledMap;
import laya.maths.Rectangle;
import laya.net.Loader;
import laya.utils.Handler;
import view.TestView;

public class LayaUISample {

public function LayaUISample() {
//初始化引擎
Laya.init(1500, 900);
//加载引擎需要的资源
var map1:TiledMap = new TiledMap();
map1.createMap("aa.json",new Rectangle(0,0,1200,720),Handler.create(this,loadMap_1_OK));

}
private function loadMap_1_OK():void{
console.log("地图三加载完成");
}

}
}