A microblog in node.js

This is a microblog developed with node.js v8.1.2 and express 4.15.0, for the purpose of practice.

用node.js v8.1.2和express 4.x重写《node.js开发指南》的微博示例，并进行扩充。

17/7/7 Add verification for the submitted registery information 添加对用户输入信息的验证