text: const yargs = require('yargs')
  const Server = require('./app')
  
  const argv = yargs
      .usage('anywhere [options]')
      .option('p',{
          alias:'port',
          describe:'端口号',
          default:'8000'
      })
      .version()
      .alias('v','version')
      .help()
      .argv;
  const sd = new Server(argv)
  sd.start()