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<>需求
最近有一个有趣的需求，用户家庭账号体系的建立，前提（小程序开发，前端无法检测小程序彻底退出），家庭中的成员账号A切换登录之前还需要判断另一个账B号的最后使用时间，如果账号A在
两个小时内登录过，会对账号A有一个提示，是否挤掉账号B，同时账号B再调用请求的时候，也会收到被账号A挤掉通知，退出到授权登录界面。
<>解决办法
由于上面的需求想到的解决办法是使用Redis，Redis中为每一个账号设置一个有效时间（2小时）的token值，通过判断每一个用户token值是否存在，来判断挤掉账号时候各种提醒内容。但是这里会有一个问题，需求要求token失效时间是2小时，上一个账号两个小时内
登录过才会进行提醒(需要判断上一个账号最后更新token时间)，所以前端在每个请求调用的时候，后端都需要更新一下redis的过期时间。
* Node.js中引用Redis var redis = require('redis'), PORT = 6389,//端口号 HOST =
'127.0.0.1', //服务器IP PWD = '88888888888888', //密码 OPTS = {},//设置项 rclient =
redis.createClient(RDS_PORT,RDS_HOST,RDS_OPTS);
rclient.auth(RDS_PWD,function(){ console.log('redis通过认证'); }); //redis数据库
rclient.set('token','kaola');//赋值
* Redis设置key的过期时间 rclient.expire('token',60);//设置60秒自动过期
*
Redis更新key的过期时间
对一个已经带有生存时间的 key 执行 EXPIRE 命令，新指定的生存时间会取代旧的生存时间
rclient.expire('token',60);//更新token过期时间60秒
附:上面提到的小需求是目前想到的办法，如果有小伙伴有更好的实现方式可以评论我们一起讨论哦。
