How to generate a random number in JavaScript

In this tutorial, we are going to see how to generate a random number using the Math.random() function. The Math.random() method returns a random number between 0(inclusive) and 1(excluded), represented by [0, 1) in mathematics. This means it will return a random number such as 0.832000458799852 between the ranges 0 and 1, but never equal to 1.
 

Example 1: How to generate a random number in JavaScript

var random = Math.random(); 
alert(random);

Output:

0.6050978412398191

 

 

Example 2: How to generate a random number in JavaScript

The Math.random() method can be used to get a random number between two values. The returned value is greater than min and can optionally be equal to min (n >= min). It is also less than and not equal to max (n < max).

var min=1; 
var max=10;  
var random = Math.random() * (max - min) + min; 
alert(random);

Output:

9.884460776017944

 

 

Example 3: How to generate a random number in JavaScript

We can use this randomly generated number with the Math.floor() method to generate a random number without a comma.

var min=1; 
var max=10;  
var random = Math.floor(Math.random() * (max - min)) + min; 
alert(random);

Output:

4

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