map类型是引用类型，必须初始化才能使用，为key-value形式

    var userinfo = make(map[string]string)userinfo["username"] = "zhangsan"var user = map[string]string{"username": "张三","age":      "20",}for k, v := range user {fmt.Printf("%v %v\n", k, v)}

初始化方式可以通过make方法，遍历通过range

v, ok := user["username"]fmt.Println(v, ok)

此为查找map中key对应的值是否存在，存在ok返回true，v返回对应的值，否决ok返回false，v返回空

删除用delete函数()

delete(user, "username")

map类型的切片

	var userinfo = make([]map[string]string, 2, 2)if userinfo[0] == nil {userinfo[0] = make(map[string]string)userinfo[0]["username"] = "张三"userinfo[0]["age"] = "20"}if userinfo[1] == nil {userinfo[1] = make(map[string]string)userinfo[1]["username"] = "张si"userinfo[1]["age"] = "209"}fmt.Println(userinfo)

map类型的值可以是切片

var userinfo = make(map[string][]string)userinfo["hobby"] = []string{"吃饭","睡觉",}fmt.Println(userinfo)