ASP中一个用VBScript写的随机数类

<%
''**************************************************************************
'' CLASS: cRandom
'' Calls randomize to seed the random number generator.
'' Provides functions for returning ranged random integers or arrays of
'' ranged random integers.
''**************************************************************************
class cRandom

'' Calling randomize to seed the random number generator at the time the
'' class is created seemed like a reasonable thing to do.
private sub Class_Initialize()
'' Check the VBScript documentation for the specifics relating
'' to the Randomize function
Randomize
end sub

'' Terminate doesn''t need to do anything for this class
private sub Class_Terminate()
end sub

''**********************************************************************
'' FUNCTION: RangedRandom
'' PARAMETER: lowerBound, the lowest allowable number to return
'' PARAMETER: upperBound, the highest allowable number to return
'' RETURNS: A random integer between lowerBound and UpperBound,
'' inclusive
''**********************************************************************
public function RangedRandom( lowerBound, upperBound )
RangedRandom = CInt((upperBound - lowerBound) * Rnd + lowerBound)
end function

''**********************************************************************
'' FUNCTION: RangedRandomArray
'' PARAMETER: lowerBound, the lowest allowable number to return
'' PARAMETER: upperBound, the highest allowable number to return
'' PARAMETER: arraySize, zero based number specifying the size of the array
'' PARAMETER: duplicates, true or false to indicate whether duplicate
'' random values are allowed in the array
'' RETURNS: A single dimension array sized to match the arraySize
'' parameter, containing random integers between lowerBound and
'' upperBound, inclusive
''**********************************************************************
public function RangedRandomArray(lowerBound, upperBound, arraySize, duplicates)
dim tempArray()
dim filledElements, tempValue, badValue, i

'' resize the tempArray to hold the number of elements passed in the
'' arraySize parameter
redim tempArray(arraySize)

'' This is a loop counter, set it to 0
filledElements = 0

'' loop until filledElements is equal to the arraySize + 1
do until filledElements = arraySize + 1

'' Call the RangedRandom function with the lowerBound and upperBoundparameters
tempValue = RangedRandom( lowerBound, upperBound )

'' Handle the case where we don''t want duplicate values
if duplicates = false then
badValue = false
for i = 0 to UBound(tempArray)
'' check if the new random value already exists in the array
'' if it does set the badValue flag to true and break out of the loop
if tempValue = tempArray(i) then
badValue = true
exit for
end if
next
if badValue = false then
tempArray(filledElements) = tempValue
filledElements = filledElements + 1
end if
else
'' Handle the case where duplicate values in the array are acceptable
tempArray(filledElements) = tempValue
filledElements = filledElements + 1
end if
loop

'' return the array
RangedRandomArray = tempArray
end function

end class
%>
<%
'' All the code that follows is example code showing the use of the
'' cRandom class.

dim objRandom
dim flip
dim randomArray
dim rowsToTest
dim i, j

'' create an instance of our class
set objRandom = new cRandom

'' set the number of iterations that we want to test
rowsToTest = 10

'' "toggle" to determine whether or not we set the bgcolor of the table row
flip = true

'' Start the table
Response.Write "<table border=0 cellpadding=1 cellspacing=1>"

for j = 0 to rowsToTest
'' We''ll alternate the bgcolor of the table rows based on the
'' value of the flip variable
if flip then
Response.Write "<tr bgcolor=LightGrey>"
else
Response.Write "<tr>"
end if

'' Call the RangedRandomArray function for testing purposes
randomArray = objRandom.RangedRandomArray( 1,