[检测key值是否存在](%E6%A3%80%E6%B5%8Bkey%E5%80%BC%E6%98%AF%E5%90%A6%E5%AD%98%E5%9C%A8.md) [移除key值](%E7%A7%BB%E9%99%A4key%E5%80%BC.md) [设置keyzhi10秒钟后消失](%E8%AE%BE%E7%BD%AEkeyzhi10%E7%A7%92%E9%92%9F%E5%90%8E%E6%B6%88%E5%A4%B1.md) [查看当前key的类型](%E6%9F%A5%E7%9C%8B%E5%BD%93%E5%89%8Dkey%E7%9A%84%E7%B1%BB%E5%9E%8B.md)