JAVASCRIPT

js window width change

window.addEventListener('resize', functionName);

js window width change

function resize() {
  console.log("height: ", window.innerHeight, "px");
  console.log("width: ", window.innerWidth, "px");
}

window.onresize = resize;

javascript on screen width change

$(window).resize(function() {
  /* Do shit */
  console.log('window was resized');
});