Answers for "how to get screen width using javascript"

javascript screen size

var w = window.innerWidth;
var h = window.innerHeight;

get window size javascript

const window {
  width: window.innerWidth,
  height: window.innerHeight
}

get screen width javascript

window.screen.width
//or just
screen.width

get window height javascript

<p id="demo"></p>

<script>
document.getElementById("demo").innerHTML = 
"Screen width is " + screen.width;
</script>