Is there a way to randomize an array to a certain length in JS?

So say i have an array:

array1 = [1, 2, 3, 4, 5, ........, 50]

And I wanted to randomize that array into a new array that has length contraints.

For example, if I wanted a random array from array1 that was only 5 numbers long, I could get:

var arrayLength = 5

randomizedArray = [6, 20, 45, 2, 13]

Is there a way to do this with Math.random?