Lua 中 number 转换各种进制，以及string串转number

原文地址：http://blog.csdn.net/david_dai_1108/article/details/71699449

 --region : NumConvert.lua
 --Date   : --
 --Author : david

 -- Bin
 -- Oct
 -- Dec
 -- Hex 

 local _convertTable = {
     [] = "",
     [] = "",
     [] = "",
     [] = "",
     [] = "",
     [] = "",
     [] = "",
     [] = "",
     [] = "",
     [] = "",
     [] = "A",
     [] = "B",
     [] = "C",
     [] = "D",
     [] = "E",
     [] = "F",
     [] = "G",
 }

 local function GetNumFromChar(char)
     for k, v in pairs(_convertTable) do
         if v == char then
             return k
         end
     end
     return
 end

 local function Convert(dec, x)

     local function fn(num, t)
         if(num < x) then
             table.insert(t, num)
         else
             fn( math.floor(num/x), t)
             table.insert(t, num%x)
         end
     end

     local x_t = {}
     fn(dec, x_t, x)

     return x_t
 end

 function ConvertDec2X(dec, x)
     local x_t = Convert(dec, x)

     local text = ""
     for k, v in ipairs(x_t) do
         text = text.._convertTable[v]
     end
     return text
 end

 function ConvertStr2Dec(text, x)
     local x_t = {}
     local len = string.len(text)
     local index = len
     while ( index > ) do
         local char = string.sub(text, index, index)
         x_t[#x_t + ] = GetNumFromChar(char)
         index = index -
     end

     local num =
     for k, v in ipairs(x_t) do
         num = num + v * math.pow(x, k - )
     end
     return num
 end

 --endregion