刚学习小游戏开发，参考模板小游戏，做一个简单的页面，放置一个背景图，模拟器上面可以呈现： [图片] 但上传体验版，就显示不了，黑屏： [图片] 请教问题出在哪里。 以下完整代码： const WINDOW_INFO = wx.getWindowInfo(); const IMAGE_SRC="./images/index_bg.jpg"; const BACKGROUND_WIDTH = 1312; const BACKGROUND_HEIGHT = 736;  /**  * 游戏主函数  */ export default class Main {      constructor() {         this.init();     }          /**      * 初始化      */     init(){          //创建画布          this.canvas = wx.createCanvas();          //获取canvas的2D绘图上下文，画笔                     this.canvas.width = WINDOW_INFO.screenWidth;          this.canvas.height = WINDOW_INFO.screenHeight;          this.context  = this.canvas.getContext("2d");          //设置背景图片          this.image = wx.createImage();          this.image.src= IMAGE_SRC;          this.imageLoaded = false;          this.image.onload=()=>{               this.imageLoaded = true;          };          //将图片绘制到画布上， 并且渲染至屏幕          requestAnimationFrame(this.render.bind(this));               }     /**      * 绘制      */     render(){           const timeId= setInterval(() => {                    if(this.imageLoaded){                         console.log('图片加载成功了');                         clearInterval(timeId);                         this.context.drawImage(                             this.image,                             0,                             0,                             BACKGROUND_WIDTH,                             BACKGROUND_HEIGHT,                             0,                             0,                             this.canvas.width,                             this.canvas.height                                           );                    }else{                       console.log('图片加载中');                   }            }, 100);     } }