onClickConfirm() {     const {       dpr,       imageSrc,       x,       y,       initialScale,       scale,       clipWidth,       clipHeight,     } = this.data     const totalScale = scale * initialScale     const sx = -x / totalScale     const sy = -y / totalScale     const canvasWidth = clipWidth / totalScale     const canvasHeight = clipHeight / totalScale     this.setData({ canvasWidth, canvasHeight })     const query = wx.createSelectorQuery()     query       .select('.canvas')       .fields({ node: true, size: true })       .exec((res) => {         const canvas = res[0].node         const context = canvas.getContext('2d')         canvas.width = res[0].width * dpr         canvas.height = res[0].height * dpr         context.scale(dpr, dpr)         const canvasImg = canvas.createImage()         canvasImg.src = imageSrc         canvasImg.onload = () => {           context.drawImage(             canvasImg,             sx,             sy,             canvasWidth,             canvasHeight,             0,             0,             canvasWidth,             canvasHeight           )                   wx.canvasToTempFilePath({             fileType: 'jpg',             canvas,             success: (res) => {               // TODO: 这里在实际项目中应该是调用 wx.uploadFile 来上传采集后图片               const app = getApp()               app.globalData.avatar = res.tempFilePath               var pages = getCurrentPages(); // 获取页面栈               var currPage = pages[pages.length - 1]; // 当前页面               var prevPage = pages[pages.length - 2]; // 上一个页面               var index3=this.data.index3;             prevPage.data.fielddata[index3].img_arr=prevPage.data.fielddata[index3].img_arr.concat(res.tempFilePath)                prevPage.setData({                 fielddata:prevPage.data.fielddata// 假数据                })               wx.navigateBack()             },           })}        // })       })   },

小程序调取微信扫码支付，返回收款商户名称、金额，或者扫码支付后，带信息调 起微信小程序，目的是做个记账功能，谢谢！