ASP中VBScript生成随机数的类

<% 
''************************************************************************** 
'' CLASS: cRandom 
'' Calls randomize to seed the random number generator. 
'' Provides functions for returning ranged random integers or arrays of 
'' ranged random integers. 
'' 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 
'' 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, 10)