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 And can be used in many fields. CopyCode The 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 rangeCopy codeThe Code is as follows: function getrandomize (numstr)
Randomize
Getrandomize = int (numstr * RND) + 1)
End Function

Generate random numbers within a specified rangeCopy 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:
[Ctrl + A select all Note: To introduce external JS, refresh it before execution]