### How does single sign on work. 原理(正文+评论部分, 完美!) [What is and how does Single Sign On Authentication work?](https://auth0.com/blog/what-is-and-how-does-single-sign-on-work/) 实战(node.js版本-不依赖任何框架从0开始) [Building A Simple Single Sign On(SSO) Server And Solution From Scratch In Node.js.](https://codeburst.io/building-a-simple-single-sign-on-sso-server-and-solution-from-scratch-in-node-js-ea6ee5fdf340) 传统的方式  cookie同源策略带来的问题  sso架构图  sso流程图 
How does single sign on work.
原理(正文+评论部分, 完美!) What is and how does Single Sign On Authentication work?
实战(node.js版本-不依赖任何框架从0开始) Building A Simple Single Sign On(SSO) Server And Solution From Scratch In Node.js.
传统的方式

cookie同源策略带来的问题

sso架构图

sso流程图
