Scroll question?

Question

JavaScript

Hello everyone, how can I track the scroll of a page 300px from its start using js / jquery?
The code below didn't work.

$("body").ready(function($){
    var height = "300px";
    if ($("body").scrollTop >= height ({
        $("body").addClass("MyClass");
    } else {
        $("body").removeClass("MyClass");
    });
});

Answer 1

https://api.jquery.com/scroll/
With the help of this event (I guess)

Answer 2

so hang up the windows scroll handler, but don't need a body-ready)