Sometimes I forget the random number function of the program or the random number of javascript and vbscript. I would like to summarize the random number function of the two for future convenience.
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:
<Script language = "javascript" type = "text/javascript"> <! -- // Generate a random number ranging from 0 to 1000 var I = Math. floor (Math. random () * 1000); document. write (I); document. write ("<br>") // generate 1 ~ Random Number between 10 var j = Math. floor (Math. random () * 10) + 1; document. write (j); // --> script
[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.
The Code is as follows:
