Applet reads files

order ： Because the applet cannot directly read the contents of the file under the package , So put the file on the server , Use download to get files to applet , Get the temporary file address , And read the contents of the file

The applet reads the contents of the file

getFileData(){
  let that = this;
  const fs = wx.getFileSystemManager()
  let url = app.globalData.domain; //  Request domain name path 
  //  Download the file responded by the server to the temporary file , Read the contents of the file as needed 
  wx.downloadFile({
    url: url +'/api/otaNewFile', //  download ota.hex file 
    success (res) {
      if (res.statusCode === 200) {
        //  Method 1 ： Read file information 
        fs.readFile({
          filePath: res.tempFilePath, //  Get the temporary or local file path 
          encoding: 'hex',
          success(resd) {
            that.setData({
              otaData: resd.data
            })
            console.log(" Read file information ：",resd)
          },
        })
        //  Method 2 ： Read file information 
        // let arrBuffer = fs.readFileSync(res.tempFilePath,'hex')
        // console.log(" Read file information ：",arrBuffer)
      }
    }
  })
},

Looking forward to the follow-up ...