code: function commander (options) {
      const { cmds, version } = options
      const argvs = parseArgs()
      if (argvs._.length === 0) {
          if (argvs.v || argvs.version) {
              process.stdout.write(version + '\n' || 'unknow\n')
              process.exit()
          } else {
              help(options)
          }
      } else {
          const cmd = cmds.filter(function (v) {
              return v.command === argvs._[0] || v.aliases === argvs._[0]
          })[0]
          
          if (!cmd) {
              help(options)
          }
          cmd.module.handler(argvs)
      }
  }
docs: 入口方法（主方法）
  
  @param {Object} options