js add click listener

1document.getElementById("myBtn").addEventListener("click", function() {
2  alert("Hello World!");
3});

1document.getElementById("ELEMENT_ID").addEventListener("click", function() {
2  //insert here the code to be executed
3});

1const element = document.querySelector(".class__name");
2
3element.addEventListener("click", () => {
4	console.log("clicked element");
5});

1function eventHandler(event) {
2  if (event.type == 'fullscreenchange') {
3    /* gestire un interruttore a schermo intero */
4  } else /* fullscreenerror */ {
5    /* gestire un errore di commutazione a schermo intero */
6  }
7}