我也遇到相同问题 wxml <canvas id="rafCanvas" type="2d" style="display:none;"></canvas> ts onLoad(options) {     const eventChannel = this.getOpenerEventChannel();     // 监听acceptDataFromOpenerPage事件，获取上一页面通过eventChannel传送到当前页面的数据     eventChannel.on('acceptDataFromOpenerPage', (data: { path: string; size: number }) => {       // 通过 SelectorQuery 获取 Canvas 节点       wx.createSelectorQuery()         .select('#rafCanvas')         .fields({           node: true,         })         .exec(res => {           canvas = res[0].node;           wx.getSystemInfo({             success: res => {               this.setData({                 windowHeight: res.windowHeight,                 windowWidth: res.windowWidth,                 pixelRatio: res.pixelRatio,               });               this.analysis(data);             },             fail: err => {               console.log(err);             },           });         });     });   }, [图片]