as3.0 json的问题，读取json

Question

package
{
import com.adobe.serialization.json.JSON;

import flash.display.Sprite;
import flash.events.Event;
import flash.net.URLLoader;
import flash.net.URLRequest;

public class getJSON extends Sprite
{
    public function getJSON()
    {

        var urlLoader:URLLoader = new URLLoader();
        urlLoader.load(new URLRequest("json_example.txt"));
        urlLoader.addEventListener(Event.COMPLETE, decodeJSONHandler);

    }
    private function decodeJSONHandler(event:Event):void
    {
        var jsonArray:Array = com.adobe.serialization.json.JSON.decode(URLLoader(event.target).data);

    }

}

}
其中的json_example.txt内容是：
[
{
"href":'http://detail.tmall.com/item.htm?spm=a1z10.5-b.w4011-3014592695.95.W4nwSY&id=18065707931&rn=7d6c58742cca3a35419929331ddf6476&abbucket=2',
"imgurl":'http://img.alicdn.com/bao/uploaded/i2/TB1XkkgFVXXXXcZaXXXXXXXXXXX_!!0-item_pic.jpg_430x430q90.jpg',
"price":'398.00',
"name":'水星家纺 纯棉四件套全棉床上用品简约床单被套特价 蓝语迷情',
"id":1,

}
]
com.adobe.serialization.json.JSON和as，swf在同一目录下，求高手帮忙指导一下我代码出了什么问题。