jQuery innerHeight question

<html>
<head>
<script src='http://code.jquery.com/jquery-1.11.1.js'></script>
<script>
$(window).on('load', function() {
  $('#filler').height(window.innerHeight);
  $('#filler').text("window.innerHeight = " + window.innerHeight + ", $(window).innerHeight() = " + $(window).innerHeight());
});
</script>
</head>
<body>
    <div id='filler'></div>
</body>
</html>