text: //读取命令行上的参数列表
  /**
   * process.argv
   *
   * 第三方包
   * yargs commander
   *
  */
  const yargs = require('yargs')
  const Server = require('./app')
  
  
  const argv = yargs
    .usage('anywhere [options]')
    .option('p',{
      alias:'port',
      describe:'端口号',
      default:4000
    })
    .option('h',{
      alias:'hostname',
      describe:'host',
      default:'127.0.0.1'
    })
    .option('d',{
      alias:'root',
      describe:'root path',
      default:process.cwd()
    })
    .version()
    .alias('v','version')
    .help()
    .argv;
  
  const server = new Server(argv)
  server.start();
  