Summary of methods for generating random numbers in JS

1. Math. random (); the result is a random number (including 0, not 1) between 0 and 1. The Code is as follows:

《script》  function GetRandomNum(Min,Max){  var Range = Max - Min;  var Rand = Math.random();  return(Min + Math.round(Rand * Range));  }  var num = GetRandomNum(1,10);  alert(num);  《script》var chars = ['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'];function generateMixed(n) {   var res = "";   for(var i = 0; i < n ; i ++) {     var id = Math.ceil(Math.random()*35);     res += chars[id];   }   return res;}

1. Math. random (); the result is a random number (including 0, not 1) between 0 and 1)

2. Math. floor (num); The num parameter is a numerical value, and the function result is an integer part of num.

3. Math. round (num); The num parameter is a numerical value, and the function result is an integer rounded to num.

Math: A mathematical object that provides mathematical computation of data.

Math. random (); returns a random number between 0 and 1 (including 0, excluding 1.

Math. ceil (n); returns the smallest integer greater than or equal to n.

When Math. ceil (Math. random () * 10) is used, a random integer ranging from 1 to 10 is obtained. The probability of a random integer from 0 is very small.

Math. round (n); returns the integer value after n rounding.

Use Math. round (Math. random (); a random integer ranging from 0 to 1 can be obtained evenly.

When Math. round (Math. random () * 10) is used, a random integer ranging from 0 to 10 can be obtained in a balanced manner. The probability of obtaining the minimum value 0 and the maximum value 10 is less than half.

Math. floor (n); returns the largest integer less than or equal to n.

When Math. floor (Math. random () * 10) is used, a random integer ranging from 0 to 9 can be obtained evenly.

The above is the detailed summary of the method for JS to generate random numbers. For more information, see other related articles in the first PHP community!