code: function parseFile(target) {
    return new Promise((resolve, reject) => {
      fs.readFile(target, 'utf8', (err, data) => {
        if (err) reject(err)
        // const doc = parser.parseFromString(data, 'application/xml')
        const doc = cheerio.load(data, { xmlMode: true })
        resolve(doc)
      })
    })
  }
docs: parse the xml file using xmldom
  @param  {String} target the local path of dumpfile.xml
  @return {Promise}  the document instance of the dumpfile.xml