我们需要先下载两个库，/net/html用于解析网页对应的编码格式，/text用于将网页对应的编码格式转换为utf8

go get golang.org/x/text
go get golang.org/x/net/html

代码如下：

func main() {
	resp, err := http.Get(url)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		fmt.Errorf("wrong status code: %d",resp.StatusCode)
		return
	}

	bodyReader := bufio.NewReader(resp.Body)
	e := determineEncoding(bodyReader)
	utf8Reader := transform.NewReader(bodyReader,e.NewDecoder())
	all, err := ioutil.ReadAll(utf8Reader)
	if err != nil {
		panic(err)
	}
	fmt.Print(all)
}

// 解析编码格式
func determineEncoding(r *bufio.Reader) encoding.Encoding {
	bytes, err := r.Peek(1024)
	if err != nil {
		log.Printf("Fetcher error: %v", err)
		return unicode.UTF8
	}
	e, _, _ := charset.DetermineEncoding(
		bytes, "")
	return e
}