官网：
http://imakewebthings.com/waypoints/
页面滚动监听很简单，不多说，写个Demo：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>WayPoints</title>
<!-- Scripts -->
<script src="/Public/assets/jquery.min.js"></script>
<script src="/Public/assets/waypoints/lib/jquery.waypoints.min.js"></script>
<script src="/Public/assets/waypoints/lib/shortcuts/sticky.min.js"></script>
<script src="/Public/assets/waypoints/lib/shortcuts/inview.min.js"></script>
<style>
.stuck {
position:fixed;
top:0;
}
</style>
</head>
<body>
<div id="test1" style="height: 400px">test1</div>
<div id="test2" style="height: 400px">test2</div>
<div id="test3" style="height: 400px">test3</div>
<div id="test4" style="height: 400px">test4</div>
<div id="test5" style="height: 400px">test5</div>
<div id="test6" style="height: 400px">test6</div>
<div id="test7" style="height: 400px">test7</div>
<script>
//1.0 Common Scroll
var waypoint = new Waypoint({
element: $("#test4")[0],
handler: function(direction) {
alert('Scrolled to test4!');
this.destroy(); //表示只执行一次
},
offset: 'bottom-in-view'
//offset:100 //offset top
});
//2.0 Sticky Elements
var sticky = new Waypoint.Sticky({
element: $('#test3')[0],
wrapper: '<div class="sticky-wrapper waypoint" />',
direction: 'down right',
stuckClass: 'stuck'
});
//3.0 inview Scroll
var $example = $('#test1');
var inview;
if ($example.length) {
inview = new Waypoint.Inview({
element: $example[0],
enter: function (direction) {
alert('Enter triggered with direction ' + direction);
},
entered: function (direction) {
alert('Entered triggered with direction ' + direction);
},
exit: function (direction) {
alert('Exit triggered with direction ' + direction);
},
exited: function (direction) {
alert('Exited triggered with direction ' + direction);
}
})
}
function destroy_inview() {
$example.removeClass('waypoint');
inview.destroy()
}
function disable_inview() {
$example.addClass('disabled');
inview.disable()
}
function enable_inview() {
$example.removeClass('disabled');
inview.enable()
}
</script>
</body>
</html>
