js if window width code example

Example 1: jquery check if screen size

if ($(window).width() < 960) {
   alert('Less than 960');
}
else {
   alert('More than 960');
}

Example 2: JS get viewport width

//getting the viewport dimensions
var width= Math.max(document.documentElement.clientWidth, window.innerWidth || 0);
var height = Math.max(document.documentElement.clientHeight, window.innerHeight || 0);