[6.1 缓存的简介和配置](6.1%E7%BC%93%E5%AD%98%E7%9A%84%E7%AE%80%E4%BB%8B%E5%92%8C%E9%85%8D%E7%BD%AE.md) [6.2 文件型缓存](6.2%E6%96%87%E4%BB%B6%E5%9E%8B%E7%BC%93%E5%AD%98.md) [6.3 memcache 形式的缓存](6.3memcache%E5%BD%A2%E5%BC%8F%E7%9A%84%E7%BC%93%E5%AD%98.md) [6.4 redis 形式的缓存](6.4redis%E5%BD%A2%E5%BC%8F%E7%9A%84%E7%BC%93%E5%AD%98.md)