Javascript - add parameters to a function passed as a parameter

You can always use the bind() function to pass some arguments to your function. It'll create a new function with the first argument - arg1 - equal to the value of 3 in this example:

function one(func){
   func(5);
}

function two(arg1, arg2){
   console.log(arg1);
   console.log(arg2);
}

one(two.bind(null, 3))

You can read more about the bind() function here: MDN - Bind

Some workaround is possible

function one() {

  var args = Array.prototype.slice.call(arguments);
  var func = args[0];
  args.splice(0, 1);
  args.push(5);
  func.apply(this, args);
}

function two(arg1, arg2) {
  console.log(arg1);
  console.log(arg2);
}

one(two, 3)

There's a problem with your syntax: function one is expecting its single argument to be a function. Then, below, when you invoke it, you are not passing the function two, but whatever two returns when it's passed a single argument, probably undefined. I don't know what specifically you're trying to accomplish but I'd recommend a little research into closures.