1.安装到开发环境
npm install json-server -D
2.在根目录下下，新建db.json文件
{"list": [{"rpid": 3,"user": {"uid": "13258165","avatar": "http://toutiao.itheima.net/resources/images/98.jpg","uname": "周杰伦"},"content": "哎哟，不错哦","ctime": "10-18 08: 15","like": 126},{"rpid": 2,"user": {"uid": "36080105","avatar": "http://toutiao.itheima.net/resources/images/98.jpg","uname": "许嵩"},"content": "我寻你千百度 日出到迟暮","ctime": "11-13 11: 29","like": 88},{"rpid": 1,"user": {"uid": "30009257","avatar": "http://toutiao.itheima.net/resources/images/98.jpg","uname": "黑马前端"},"content": "学前端就来黑马","ctime": "10-19 09: 00","like": 66}]
}
3.在package.json中的script中，添加自定义命令
4.执行 npm run serve 就会执行后面的命令，以db.json为数据源，端口为3004开启一个服务
