Sharing examples of generating random numbers using javascript

This article mainly introduces relevant information summarized by several methods of generating random numbers in JavaScript. I hope that through this article, everyone can master how to implement such a method. Friends who need it can refer to it. I hope it can help everyone.

javascript Summary of several methods of generating random numbers

1. Get a random number between two numbers

function GetRandomNum(Min,Max){  
  var Range = Max - Min;  
  var Rand = Math.random();  
  return(Min + Math.round(Rand * Range));  
}

2. Mixing method

function generateMixed(n) {
   var res = "";
   for(var i = 0; i < n ; i ++) {
     var id = Math.ceil(Math.random()*35);
     res += chars[id];
   }
   return res;
}

3.Instructions

1.Math.random(); The result is a random number between 0-1 (including 0, excluding 1)
2.Math.floor(num); The parameter num is a numerical value , the function result is the integer part of num.
3.Math.round(num); The parameter num is a numerical value, and the function result is the integer after num is rounded.

Math: Mathematical object, providing mathematical calculations on 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 using Math.ceil(Math.random()*10);, you mainly get random integers from 1 to 10, and the probability of getting 0 is very small.

Math.round(n); Returns the value of n after rounding.
Use Math.round(Math.random()); to obtain a random integer from 0 to 1 evenly.
When using Math.round(Math.random()*10);, random integers from 0 to 10 can be obtained in a basically balanced manner, and 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 using Math.floor(Math.random()*10);, random integers from 0 to 9 can be obtained evenly.

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