scroll value bottom js

1window.scrollTo(0,document.body.scrollHeight);

1window.onscroll = function() {
2    let d = document.documentElement;
3    let offset = d.scrollTop + window.innerHeight;
4    let height = d.offsetHeight;
5
6    console.log('offset = ' + offset);
7    console.log('height = ' + height);
8
9    if (offset >= height) {
10        console.log('At the bottom');
11    }
12};