How to generate a random number using js _ javascript skills

The main content of this article is to summarize the examples of js random number generation methods. js random number generation mainly uses the built-in Math object's random () method, for more information about how to generate a random number using js, you can use the random () method of the built-in Math object. Usage example: Math. random (). It returns a 0 ~ A random number between 1. With this method, it is easy to understand how to generate any random number. For example, we may have the following requirements:
(1) generate a random integer between 0 and 100, then you can:

parseInt(100*Math.random()); 

Note: because the return values of Math. random () include 0 and 1, it is possible to generate 0 and 100.
(2) generate a random integer between m-n. For example, to generate a random number between 5-15, you can:

parseInt(Math.random()*(15-5+1) + 5); 

In general, it is:

ParseInt (Math. random () * (n-m + 1) + m); // generates a random integer between m-n.

In addition, the following two common methods are summarized as needed:
(3) generate a random integer with the specified number of digits

Function randomNum (n) {var t = ''; for (var I = 0; I
 
  

  
(4) generate a random integer in the specified range

  

  
function randomNum(minNum,maxNum){  switch(arguments.length){  case 1:   return parseInt(Math.random()*minNum+1);  break;  case 2:   return parseInt(Math.random()*(maxNum-minNum+1)+minNum);  break;  default:   return 0;  break;  } } 
  

  
For example, to generate a random integer between 2-9, then: randomNum (), generate a random integer between 1-22, then: randomNum (22)
  
The above is the method used to generate random numbers in summary js. I hope it will be helpful for your learning.