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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>index demo</title>
<style>
div {
background: yellow;
margin: 5px;
}
span {
color: red;
}
</style>
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
</head>
<body>
<span>Click a div!</span>
<div>First div</div>
<div>Second div</div>
<div>Third div</div>
<script>
$( "div" ).click(function() {
// `this` is the DOM element that was clicked
var index = $( "div" ).index( this );
$( "span" ).text( "That was div index #" + index );
});
</script>
</body>
</html>