egret 自定义类的方法

class Jingling extends egret.Bitmap{
     name;
    public constructor(){
        super();
    }
   
}

   let icon: Jingling = this.createBitmapByName("egret_icon_png");
        icon.anchorOffsetX = icon.width / 2;
        icon.anchorOffsetY = icon.height / 2;
        icon.name = 233;
        console.log(icon.name);
        this.addChild(icon);
        icon.x = 326;
        icon.y = 233;