1//get screen height of the device by using
2window.innerHeight
3//get screen width of the device by using
4window.innerWidth

1const window {
2  width: window.innerWidth,
3  height: window.innerHeight
4}

1window.screen.width
2//or just
3screen.width

1<p id="demo"></p>
2
3<script>
4document.getElementById("demo").innerHTML = 
5"Screen width is " + screen.width;
6</script>