Base64是网络上最常见的用于传输8Bit字节代码的编码方式之一，大家可以查看RFC2045～RFC2049，上面有MIME的详细规范。Base64编码可用于在HTTP环境下传递较长的标识信息。-Base64 is the most common on the network for transmission 8Bit encoding of byte code, we can see RFC2045 ~ RFC2049, the above detailed specifications h