Summary of javascript random numbers and vbscript (asp) random numbers attached to advanced applications

1. javascript random number function Math. random ()
Generate random numbers within a specified range
The Math. random () method has no parameters. 0 ~ is returned ~ Random number between 1. If 0 ~ is to be generated ~ Random between n
Number, which can be in the following format:

Math. floor (Math. random () * n)
To generate m ~ Random Number between n, which can be used:
Math. floor (Math. random () * n) + m

The following is an application:

[Ctrl + A select all Note: If you need to introduce external Js, You need to refresh it to execute]

Javascript random number advanced application
① Since JavaScript was generated, many browsers have built-in random number generation methods. For example:
Var number = Math. random ();
This method generates a floating point number between 0 and 1.
② Based on Time, random numbers can also be generated. For example:
Var now = new Date ();
Var number = now. getSeconds ();
This generates an integer ranging from 0 to 59 based on the current time.
Var now = new Date ();
Var number = now. getSeconds () % 43;
This generates an integer ranging from 0 to 42 based on the current time.
③ Here we will introduce a fairly good random number generator program, which can be applied in many fields.
Copy codeThe Code is as follows:
<Script language = "JavaScript"> <! --
// The Central Randomizer 1.3 (C) 1997 by Paul Houle
Houle@msc.cornell.edu)
// See: http://www.msc.cornell.edu /~ Houle/javascript/randomizer.html
Rnd. today = new Date ();
Rnd. seed = rnd. today. getTime ();
Function rnd (){
Rnd. seed = (rnd. seed * 9301 + 49297) % 233280;
Return rnd. seed/(233280.0 );
};
Function rand (number ){
Return Math. ceil (rnd () * number );
};
// End central randomizer. -->
</Script>

Ii. vbscript (asp) Random Number
Vbs Random Number Generation
A random number with no specified range
Copy codeThe Code is as follows:
Function GetRandomize (numstr)
Randomize
GetRandomize = Int (numstr * Rnd) + 1)
End Function

Generate random numbers within a specified range
Copy codeThe Code is as follows:
Function MyRnd (NumMin, NumMax)
Randomize
MyRnd = Int (Rnd * (NumMax-NumMin + 1) + NumMin
End Function

Below are some examples of js random numbers.
Copy codeThe Code is as follows:
<Script>
// Declare a random number variable. The default value is 1.
Var GetRandomn = 1;
// Obtain the function of the value in the random range
Function GetRandom (n) {GetRandomn = Math. floor (Math. random () * n + 1 )}
// Start the call and obtain a random number ranging from 1.
GetRandom ("100 ");
// View output
Document. write (GetRandomn)
</Script>

Is the Code quite concise? GetRandomn is the random number variable and can be called at will.
Let's take a random display of the special effect code:
<Script>
// At the beginning, obtain a random number ranging from 1 to 3.
GetRandom ("3 ");
// Call a project that meets the random number
Switch (GetRandomn ){
Case 1:
Document. write ("when the random number is 1, the script home is displayed ")
Break;
Case 2:
Document. write ("www.jb51.net" is displayed when the random number is 2 ")
Break;
}
</Script>

DEMO code:

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