Don't make functions within a loop
by HaJIuBauKa
HTML
<div class="myClass">1</div>
<div class="myClass">2</div>
<div class="myClass">3</div>
<div class="myClass">4</div>
<div class="myClass">5</div>
<div class="myClass">6</div>
<div class="myClass">7</div>
<div class="myClass">8</div>
JavaScript
"use strict";
var elems = document.getElementsByClassName("myClass"), i;
for (i = 0; i < elems.length; i++) {
elems[i].addEventListener("click", function () {
this.innerHTML = i;
});
}