code: function fsRead(filePath) {
      return new Promise((resolve, reject) => {
          fs.readFile(filePath, (err, data) => {
              if (err) {
                  if (err.syscall === 'open') {
                      console.log('Open "' + err.path +'" fail!')
                  }
                  reject(err);
              }
              resolve(data.toString())
          })
      })
  }
docs: Read file
  
  @param {string} filePath file path
  @return {Object} Promise