go语言自定义结构体实现io.Write接口

package main
import "fmt"
type Demo struct {
ByteBuffer []byte
}
func (demo *Demo)Write(p []byte) (n int, err error)  {
for _,v:=range p {
demo.ByteBuffer = append(demo.ByteBuffer, v)
}
return len(p),nil
}
func main() {
var demo Demo
fmt.Printf("%s\n",string(demo.ByteBuffer))
fmt.Fprintf(&demo,"Hello, %s","世界!")
fmt.Printf("%s\n",string(demo.ByteBuffer))
}