該strings.Join函數(shù)僅采用字符串切片：s := []string{"foo", "bar", "baz"}fmt.Println(strings.Join(s, ", "))但是能夠傳遞實(shí)現(xiàn)ToString()函數(shù)的任意對(duì)象將是一個(gè)很好的選擇。type ToStringConverter interface {    ToString() string}Go中是否有類似的東西，還是我必須int用ToString方法來(lái)修飾現(xiàn)有類型并編寫一個(gè)包裝器strings.Join？func Join(a []ToStringConverter, sep string) string