let filePath = `${wx.env.USER_DATA_PATH}/${picture.id}-${picture.billName}`
    fs.writeFile({
      filePath

保存成功了，路径为 打印如57

wx.getImageInfo({
    // src: self.data.tempImageSrc,
    src: `${wx.env.USER_DATA_PATH}/575655268021449029-下元节10.jpg`})

读取报错！