Onclick 按钮只工作一次。 Div 滑块 scrollIntoView

Question

I made a slider, but I am coming up with a problem on the javascript side of things. When I use the navigation buttons I made it will work one time, but after the first initial clicks on the buttons i get a "Uncaught TypeError"

Website

Tried to recreate it in jfiddle for you guys, but was unsuccessful, but here's the jfiddle so you can mess with the code.

Jfiddle

PLEASE NOTE

The reason I am using scrollIntoView is because all of my elements have a dynamic width (vw, vh, %), and I do not have the coding knowledge in java script to code that correctly.

            function pageonerby() {
            var elem = document.getElementById("hometwo");
            elem.scrollIntoView(top);
            if (elem.scrollIntoView = true) {
                window.scrollTo(0, 0);
            }
        }

        function pagetwoer() {
            var elem = document.getElementById("homethree");
            elem.scrollIntoView();
            if (elem.scrollIntoView = true) {
                window.scrollTo(0, 0);
            }
        }

        function pagethreeer() {
            var elem = document.getElementById("homeone");
            elem.scrollIntoView();
            if (elem.scrollIntoView = true) {
                window.scrollTo(0, 0);
            }
        }

Answer 1

            function pageonerby() { 
            var elem = document.getElementById("hometwo"); 
            elem.scrollIntoView();
            window.scrollTo(0,0);
            } 

it's fixed.