实现图片滚动

简要截图:
简要代码:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title>滚动图片效果展示</title>
    <script src="http://cdn.bootcss.com/jquery/2.1.1/jquery.js"></script>
    <script src="http://cdn.bootcss.com/velocity/1.2.3/velocity.js"></script>
    <style type="text/css">
       div:not(:last-of-type){
           80%;height:750px;margin:0 auto;
       }
       div:first-of-type{background:url(imgs/1.jpg);background-size:cover;}
       div:nth-of-type(2){background:url(imgs/2.jpg);background-size:cover;}
       div:nth-of-type(3){background:url(imgs/3.jpg);background-size:cover;}
       div:nth-of-type(4){background:url(imgs/4.jpg);background-size:cover;}
       div:nth-of-type(5){background:url(imgs/5.jpg);background-size:cover;}
       div:nth-of-type(6){background:url(imgs/6.jpg);background-size:cover;}
       div:nth-of-type(7){background:url(imgs/7.jpg);background-size:cover;}
       div:last-of-type{position:fixed;top:130px;right:50px;}
       div:last-of-type ul{list-style:none;}
       div:last-of-type ul li{30px;height:30px;background:black;margin:3px;color:white;text-align:center;line-height:30px;}
        div:last-of-type ul li:hover {cursor:pointer; }
     
    </style>
</head>
<body>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div>
        <ul><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li></ul>
    </div>
</body>
</html>
<script type="text/javascript">
    $("div:last ul li").click(function () {
        var numLi = $(this).text();
        $("div:last ul li").css({ "background-color": "black", "color": "white" });//每次都对所有的li背景色进行初始化,点击哪个改变哪个li的背景颜色和字体颜色
        switch (numLi) {
            case "1": $("div:first").velocity("scroll", { duration: 300 }); $(this).css({"background-color":"white","color":"black"});break;
            case "2": $("div:eq(1)").velocity("scroll", { duration: 300 }); $(this).css({ "background-color": "white", "color": "black" }); break;
            case "3": $("div:eq(2)").velocity("scroll", { duration: 300 }); $(this).css({ "background-color": "white", "color": "black" }); break;
            case "4": $("div:eq(3)").velocity("scroll", { duration: 300 }); $(this).css({ "background-color": "white", "color": "black" }); break;
            case "5": $("div:eq(4)").velocity("scroll", { duration: 300 }); $(this).css({ "background-color": "white", "color": "black" }); break;
            case "6": $("div:eq(5)").velocity("scroll", { duration: 300 }); $(this).css({ "background-color": "white", "color": "black" }); break;
            case "7": $("div:eq(6)").velocity("scroll", { duration: 300 }); $(this).css({ "background-color": "white", "color": "black" }); break;

        }
    });
 
</script>