我是新手，無法弄清楚為什么最后一個 case 子句（連接和測試）會變成默認值。但是帶有換行符的那些（退出\r\n 和連接\r\n）不會沒有 fallthrough 語句。我試過標記開關并調用 break [lbl] 但默認塊仍然被執(zhí)行package mainimport ("fmt""strings""bufio""os")func main() {var cmd stringbio := bufio.NewReader(os.Stdin)fmt.Println("Hello")proceed := truefor proceed {    fmt.Print(">> ")    cmd, _ = bio.ReadString('\n')    cmds := strings.Split(cmd, " ")    for i := range cmds{        switch cmds[i]{            case "exit\r\n" :                proceed = false            case "connect\r\n":                fmt.Println("The connect command requires more input")            case "connect":                if i + 2 >= len(cmds) {                    fmt.Println("Connect command usage: connect host port")                } else {                    i++                    constring := cmds[i]                    i++                    port := cmds[i]                    con(constring, port)                    }                fmt.Println("dont print anything else, dont fall through to default. There should be no reason why the default caluse is executed???")            case "test":                fmt.Println("dont print anything else, dont fall through to default. There should be no reason why the default caluse is executed???")            default:                fmt.Println("Unrecognised command: " + cmds[i])        }     }}}func con (conStr, port string){panic (conStr)}