javascript if window size is less than code example

Example 1: jquery check if screen size

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

Example 2: javascript check less width of window

window.addEventListener("resize", function() {
  if (window.matchMedia("(min-width: 500px)").matches) {
    console.log("Screen width is at least 500px")
  } else {
    console.log("Screen less than 500px")
  }
})