在使用map的过程中，有两个问题是经常会遇到的：读写冲突和遍历无序性。为什么会这样呢，底层是怎么实现的呢？带着这两个问题，我简单的了解了一下map的增删改查及遍历的实现。

Map is like a Go map[interface{}]interface{} but is safe for concurrent useby multiple goroutines without additional locking or coordination.Loads, stores, and deletes run in amortized constant time.