The Math.random() function is used to return a floatingpoint pseudorandom number between range [0,1) , 0 (inclusive) and 1 (exclusive).This random number can then be scaled according to the desired range.
Syntax:
Math.random();
Parameters: This function does not accepts any parameter.
Return Value: The math.random() function returns a floatingpoint, pseudorandom number between range [0,1) , 0 (inclusive) and 1 (exclusive).
Below are some examples of using Math.random() in JavaScript to generate random numbers in different ranges:

Getting a random number between 0 (inclusive) and 1 (exclusive): For getting a random number between 0(inclusive) and 1(exclusive),the following code can be executed:
<
script
type
=
"text/javascript"
>
var random = Math.random( );
document.write("Random Number Generated : " + random );
</
script
>
Output:
Random Number Generated : 0.2894437916976895

Getting a random number between two values: Math.random() can be used to get a random number between two values. The returned value is no lower than min and may possibly be equal to min, and it is also less than and not equal to max.
For getting a random number between two values the math.random() function can be executed in the following way:
<
script
type
=
"text/javascript"
>
var min=4;
var max=5;
var random = Math.random() * (+max  +min) + +min;
document.write("Random Number Generated : " + random );
</
script
>
Output:
Random Number Generated : 4.991720937372939

Getting a random integer between two values: Math.random() can be used to get an integer between two values. The returned value is no lower than min or it is the next integer greater than min if min isn’t an integer.It is also less than but not equal to max.
For getting a random integer between two values the Math.random() function can be executed in the following way:
<
script
type
=
"text/javascript"
>
var min=4;
var max=5;
var random =Math.floor(Math.random() * (+max  +min)) + +min;
document.write("Random Number Generated : " + random );
</
script
>
Output:
Random Number Generated : 4
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