javascript Math.random() random number function_basic knowledge

random function syntax
Math.random();

random function parameters
No parameters
random function return value
Returns a pseudo-random number between 0 and 1, possibly 0 , but always less than 1, [0,1)

random function example
document.write(Math.random());

Return a random number
document.write (Math.random()*(20-10) 10);

Returns a random number from 10-20
document.write(Math.random()*(n-m) m);

The formula that returns a random number in the specified range (between m-n)