Deeno

let div = document.querySelector("div");

if (window.innerWidth > 768) {
  div.addEventListener("mouseover", function () {
    console.log("works");
  });
} else if (window.innerWidth < 768) {
  div.addEventListener("click", function () {
    console.log("works");
  });
}

let button = document.querySelector('button')
button.addEventListener('click' , function(){
  this.classList.toggle('active')
})

let inp = document.querySelector("input");

inp.addEventListener("input", function() {
  if (this.value == 0) {
    console.log("0 is not supported");
    this.value = "";
  } else {
    console.log(this.value);
  }
});