解碼

encoding := base64.StdEncoding
data := []byte(`Zm9vIGJhcg==`)
decoded := make([]byte, encoding.DecodedLen(len(data)))
n, err := encoding.Decode(decoded, data)
if err != nil {
    log.Fatal(err)
}

// Because we don't know the length of the data that is encoded
// (only the max length), we need to trim the buffer to whatever
// the actual length of the decoded data was.
decoded = decoded[:n]

fmt.Printf("`%s`", decoded)
// Output: `foo bar`

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