1.定义一个集合 感觉和python的字典差不多

func main() {	//定义一个集合	var countryCapitalMap map[string]string /*创建集合 */	//创建集合	countryCapitalMap = make(map[string]string)	/* map插入key - value对,各个国家对应的首都 */	countryCapitalMap["France"] = "Pais"	countryCapitalMap["Italy"] = "罗马"	countryCapitalMap["Japan"] = "东京"	countryCapitalMap["India "] = "新德里"	fmt.Println(countryCapitalMap)}

　　

2.循环输出key value

func main() {    var countryCapitalMap map[string]string /*åˆ›å»ºé›†åˆ */    countryCapitalMap = make(map[string]string)    /* mapæ’å…¥key - value对,å„个国家对应的首都 */    countryCapitalMap["France"] = "Paris"    countryCapitalMap["Italy"] = "罗马"    countryCapitalMap["Japan"] = "东京"    countryCapitalMap["India "] = "新德里"    for country := range countryCapitalMap {        fmt.Println(country, countryCapitalMap[country])    }}

　　

3.判断key是否存在

var countryCapitalMap map[string]string /*创建集合 */	countryCapitalMap = make(map[string]string)	/* map插入key - value对,各个国家对应的首都 */	countryCapitalMap["France"] = "Paris"	countryCapitalMap["Italy"] = "罗马"	countryCapitalMap["Japan"] = "东京"	countryCapitalMap["India "] = "新德里"        //ok为bool值，为true那么captial就是这个key的value	captial, ok := countryCapitalMap["Italy"]	if ok {		fmt.Println(ok, "存在首都是", captial)	} else {		fmt.Println("不存在")	}

　　

4.删除key value

   var countryCapitalMap map[string]string /*åˆ›å»ºé›†åˆ */    countryCapitalMap = make(map[string]string)    /* mapæ’å…¥key - value对,å„个国家对应的首都 */    countryCapitalMap["France"] = "Paris"    countryCapitalMap["Italy"] = "罗马"    countryCapitalMap["Japan"] = "东京"    countryCapitalMap["India "] = "新德里"    delete(countryCapitalMap, "France")    fmt.Println(countryCapitalMap)