為了實際更改struct方法中的字段，您需要一個指針類型的接收器。我明白那個。為什么我不能滿足io.Writer具有指針接收器的接口，以便我可以更改結構字段？有沒有慣用的方法來做到這一點？// CountWriter is a type representing a writer that also countstype CountWriter struct {    Count      int    Output     io.Writer}func (cw *CountWriter) Write(p []byte) (int, error) {    cw.Count++    return cw.Output.Write(p)}func takeAWriter(w io.Writer) {    w.Write([]byte("Testing"))}func main() {    boo := CountWriter{0, os.Stdout}    boo.Write([]byte("Hello\n"))    fmt.Printf("Count is incremented: %d", boo.Count)    takeAWriter(boo)}該代碼產生此錯誤：prog.go:27:13: cannot use boo (type CountWriter) as type io.Writer in argument to takeAWriter:    CountWriter does not implement io.Writer (Write method has pointer receiver)看來您既可以滿足Writer界面要求，也可以對實際的struct. 如果我將 Write 方法更改為值接收器 ( func (cw CountWriter) Write...)，我可以避免錯誤，但值不會增加。:(https://play.golang.org/p/pEUwwTj0zrb