c:\users\guo\desktop\testapi>npm init
this utility will walk you through creating a package.json file.
it only covers the most common items, and tries to guess sensible defaults.
see `npm help json` for definitive documentation on these fields
and exactly what they do.
use `npm install <pkg> --save` afterwards to install a package and
save it as a dependency in the package.json file.
press ^c at any time to quit.
name: (testapi)
version: (1.0.0)
description: 测试api
entry point: (index.js)
test command:
git repository:
keywords:
author: 郭东生
license: (isc)
about to write to c:\users\guo\desktop\testapi\package.json:
{
  name: testapi,
  version: 1.0.0,
  description: 测试api,
  main: index.js,
  scripts: {
    test: echo \error: no test specified\ && exit 1
  },
  author: 郭东生,
  license: isc
}
is this ok? (yes)
c:\users\guo\desktop\testapi>
c:\users\guo\desktop\testapi>
一键生成koa/koa2项目：1、 npm install -g koa-generator2、新建项目目录 koa mytest （koa1项目） koa2 koa2test (koa2项目)3、进入目录 cd koa2test4、安装依赖 npm install5、运行 npm start

以上就是koa2的详细内容。