bootstrap scroll down the page

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
   <script src="js/jquery-1.11.0.min.js"></script>
   <script src="js/jquery.touchSwipe.min.js"></script>
    <style>
        #screen1{
            background-color: #ddd;
            display: block;
            position: absolute;
            width: 100%;
            height: 100%;
        }
        #screen2{
            display: none;
            position: absolute;
            background-color: pink;
            width: 100%;
            height: 100%;
        }
        #screen3{
            display: none;
            position: absolute;
            background-color: #00f;
            width: 100%;
            height: 100%;
        }
    </style>
</head>
<body id="orientation">
    <div class="screen1" id="screen1" >

    </div>
    <div class="screen2" id="screen2">

    </div>
    <div class="screen3" id="screen3" >

    </div>
    <script>
        $(function () {
            function switcher(id, nextid, xiaid) {
                $(id).swipe({
                            swipe: function (event, direction, distance, duration, fingerCount) {
                                if (direction == "up") {
                                    $(nextid).show();
                                    $(this).hide();
                                }
                                else if (direction == "down") {
                                    $(xiaid).show();
                                    $(this).hide();
                                }
                            }
                        }
                );
            }
            $("#screen1").swipe({
                        swipe: function (event, direction, distance, duration, fingerCount) {
                            if (direction == "up") {
                                $("#screen2").show();
                                $("#screen1").hide();
                            }
                        }
                    }
            )
            switcher("#screen2", "#screen3", "#screen1");
            $("#screen3").swipe({
                        swipe: function (event, direction, distance, duration, fingerCount) {
                            if (direction == "down") {
                                $("#screen3").hide();
                                $("#screen2").show();
                            }
                        }
                    }
            );
        });
    </script>
</body>
</html>
<script>
   var c = "http://oss.tunji99.com/tunji-dev/20191107/14d11fa494a947539606aa9b94ddf818.png!q_max3,http://oss.tunji99.com/tunji-dev/20191107/14d11fa494a947539606aa9b94ddf818.png!q_max3,";
   var e = c.search("http://oss.tunji99.com/tunji-dev/20191107/14d11fa494a947539606aa9b94ddf818.png!q_max3,","");
   console.log(e);
</script>
bootstrap scroll down the page

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