GO map 学习

初始化
```go
//Java
Map<String , Integer> map = new HashMap();// go
m = make(map[string] int)
colors := map[string]string{}
```
语法差距还是蛮大的。删除
```go
delete(m, "abc")
```判断
```go
if val, ok := m["1234"]; ok {fmt.Println(val)
}
```