<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JS Bin</title>
<style>
div {
width: 100px;
height: 100px;
border: 2px solid #ccc;
background: blue;
}
</style>
</head>
<body>
<div></div>
<script>
var i = 0;
document.getElementsByTagName('div')[0].onclick = function() {
console.log(++i);
}
</script>
</body>
</html>