一个基于jwt以及cookie的单点登录—koa2 + mongoDB + mongoose + jwt
一个一级域名下有多个二级域名，用户在同一个浏览器在同一个一级域名上登录后。同一个浏览器浏览其它同一级域名的应用无需重复认证。
foo.com、a.foo.com、b.foo.com、c.foo.com
利用cookie同一个一级域名（domain）下可以共享的特性， 以及jwt把登录态存在用户侧的特点。即可以在下发cookie的时候设置domain为一级域名。这样在访问任意相同一级域名（domain）的应用浏览器均会带上这个泛域名cookie。 另外jwt的实现是把非私密信息存储在token中，并使用密钥进行签名。多个二级域名只需要同步加密密钥，既可以验证token的有效性。
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