asp产生随机数

<%Function gen_key(digits)

'Create and define arraydim char_array(50)char_array(0) = "0"char_array(1) = "1"char_array(2) = "2"char_array(3) = "3"char_array(4) = "4"char_array(5) = "5"char_array(6) = "6"char_array(7) = "7"char_array(8) = "8"char_array(9) = "9"char_array(10) = "A"char_array(11) = "B"char_array(12) = "C"char_array(13) = "D"char_array(14) = "E"char_array(15) = "F"char_array(16) = "G"char_array(17) = "H"char_array(18) = "I"char_array(19) = "J"char_array(20) = "K"char_array(21) = "L"char_array(22) = "M"char_array(23) = "N"char_array(24) = "O"char_array(25) = "P"char_array(26) = "Q"char_array(27) = "R"char_array(28) = "S"char_array(29) = "T"char_array(30) = "U"char_array(31) = "V"char_array(32) = "W"char_array(33) = "X"char_array(34) = "Y"char_array(35) = "Z"

'Initiate randomize method for default seedingrandomize

'Loop through and create the output based on the the variable passed to'the function for the length of the key.do while len(output) < digitsnum = char_array(Int((35 - 0 + 1) * Rnd + 0))output = output + numloop

'Set returngen_key = outputEnd Function

'Write the results to the browser, currently setting a 13 digit key

  response.write "<pre>" & gen_key(3) & "</pre>" & vbcrlf%>