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lua中对字符串进行Base64加密的函数。备份！

function str2base64(str)
 local b64chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
 local s64 = ''

 while #str > 0 do -- iterate through string
  local bytes_num = 0 -- number of shifted bytes
...