map

package main

import (
	"fmt"
)

func prt_map(m map[int]string) {
	//for i,v := range m 一样可以
	for i := range m {
		fmt.Printf("i:%d,v:%s\n", i, m[i])
	}
}

func main() {
	//先声明
	var m map[int]string
	//再分配容量
	m = make(map[int]string)
	m[1] = "a"
	m[2] = "b"
	m[3] = "c"
	prt_map(m)

	//删除数据
	delete(m, 2)
	fmt.Println(m) //map[1:a 3:c]

}