TIPS ： Base64 is one of the most common encoding methods for transmitting 8bit byte code on the network. Base64 is a method to represent binary data based on 64 printable characters. Base64 encoding is a process from binary to character, which can be used to transfer long identification information in HTTP environment. Base64 encoding is unreadable and can only be read after decoding. Base64 is widely used in various fields of computer due to the above advantages. However, since the output content includes more than two ’symbol class ‘ characters (+, /, =), various ‘variants’ of Base64 have been developed in different application scenarios. In order to unify and standardize the output of Base64, base62x is regarded as an improved version without symbol.