# Functions
Base64 generates a random base62 string with length of n.
Base64 generates a random base64 string with length of n.
Bytes generates n random bytes.
Hex generates a random hex string with length of n e.g: 67aab2d956bd7cc621af22cfb169cba8.
key随意设置 data 要加密数据.
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String generates a random string using only letters provided in the letters parameter if user ommit letters parameters, this function will use defLetters instead.