golang不定长传参

golang不定长传参，三个点... 可以很灵活的传入多个参数，给两个例子，一看就明白了

1、int类型不定长传参

package mainimport "fmt"func main() {    fmt.Println(Sum(1, 4, 6, 7, 8, 9, 100, 200))}func Sum(numbers ...int) int {    result := 0    for _, n := range numbers {        result += n    }    return result}

 go run test1.go 335

2、map类型不定长传参

package mainimport "fmt"func main() {    fmt.Println(SumMap(map[string]string{"Italy": "Rome"}, map[string]string{"Japan": "Tokyo"}, map[string]string{"china": "beijing"}))}func SumMap(countryCapitalMaps ...map[string]string) map[string]string {    var result map[string]string    result = make(map[string]string)    //注意：这里需要先把多个map的顺序取出，否则会报错    //cannot use k (type int) as type string in map index    //cannot use v (type map[string]string) as type string in assignment    for i, num := range countryCapitalMaps {        fmt.Println(i)        fmt.Println(num)        for k, v := range num {            result[k] = v        }    }    return result}

go run test2.go  //这里会打印map的顺序号和值0map[Italy:Rome]1map[Japan:Tokyo]2map[china:beijing]map[Italy:Rome Japan:Tokyo china:beijing]