cocos creator 3.1.0 照官方给的demo进行编写 图片显示不出来

import { _decorator, Component, Node } from 'cc';
const { ccclass, property } = _decorator;
import * as fgui from "fairygui-cc"

@ccclass('Typescript')
export class Typescript extends Component {
    private _view: fgui.GComponent = new fgui.GComponent;
    private _bagWindow: fgui.Window = new BagWindow;

    onLoad () {
        debugger
        fgui.GRoot.create();
        fgui.UIPackage.loadPackage("Bag", this.onUILoaded.bind(this));
    }

    onUILoaded() {
        this._view = fgui.UIPackage.createObject("Bag", "Main").asCom;
        this._view.makeFullScreen();
        fgui.GRoot.inst.addChild(this._view);


        this._bagWindow = new BagWindow();
        this._view.getChild("bagBtn").onClick(() => { this._bagWindow.show(); }, this);
    }
}
class BagWindow extends fgui.Window {
    public constructor() {
        super();
    }

    protected onInit(): void {
        debugger
        this.contentPane = fgui.UIPackage.createObject("Bag", "BagWin").asCom;
        this.center();
    }

    protected onShown(): void {
        var list: fgui.GList = this.contentPane.getChild("list",fgui.GList);
        list.on(fgui.Event.CLICK_ITEM, this.onClickItem, this);
        list.itemRenderer = this.renderListItem.bind(this);
        list.setVirtual();
        list.numItems = 45;
    }

    private renderListItem(index: number, obj: fgui.GObject): void {
        debugger
        obj.icon = "Icons/i" + Math.floor(Math.random() * 10);
        obj.text = "" + Math.floor(Math.random() * 100);
    }

    private onClickItem(item: fgui.GObject): void {
        this.contentPane.getChild("n11",fgui.GLoader).url = item.icon;
        this.contentPane.getChild("n13").text = item.icon;
    }
}
 
图片已经转换成spriteFrame类型了