How to solve the Chinese garbled code in golang zip

func Unzip(zipFile string, destDir string) error {
    zipReader, err := zip.OpenReader(zipFile)
    if err != nil {
        return err
    }
    defer zipReader.Close()
    var decodeName string
    for _, f := range zipReader.File {
        if f.Flags == 0{
            //如果标致位是0  则是默认的本地编码   默认为gbk
            i:= bytes.NewReader([]byte(f.Name))
            decoder := transform.NewReader(i, simplifiedchinese.GB18030.NewDecoder())
            content,_:= ioutil.ReadAll(decoder)
            decodeName = string(content)
        }else{
            //如果标志为是 1 << 11也就是 2048  则是utf-8编码
            decodeName = f.Name
        }
        fpath := filepath.Join(destDir, decodeName)
        if f.FileInfo().IsDir() {
            os.MkdirAll(fpath, os.ModePerm)
        } else {
            if err = os.MkdirAll(filepath.Dir(fpath), os.ModePerm); err != nil {
                return err
            }
            inFile, err := f.Open()
            if err != nil {
                return err
            }
            defer inFile.Close()
            outFile, err := os.OpenFile(fpath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
            if err != nil {
                return err
            }
            defer outFile.Close()
            _, err = io.Copy(outFile, inFile)
            if err != nil {
                return err
            }
        }
    }
    return nil
}