buffer 转Writer或Reader

To Writer

参考文档: https://stackoverflow.com/questions/23454940/getting-bytes-buffer-does-not-implement-io-writer-error-message

示例:

import "bufio"
import "bytes"

func main() {
    var b bytes.Buffer
    foo := bufio.NewWriter(&b)
}

方式2:

package main

import "bytes"
import "io"

func main() {
    var b bytes.Buffer
    _ = io.Writer(&b)
}