To get a pseudo-random number between 0 and 1, use the Math.random() method in JavaScript.
Example
You can try to run the following code to get a pseudo-random number between 0 and 1 −
<html> <head> <title>JavaScript Math random() Method</title> </head> <body> <script> var value = Math.random( ); document.write("First Value : " + value ); value = Math.random( ); document.write("<br />Second Value : " + value ); </script> </body> </html>