单行图片向上滚动

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>图片单行向上滚动</title>

css片段
    <style>
        *{
            padding: 0;
            margin: 0;
            list-style: none;
        }
        #app{
            position: relative;
            width: 600px;
            height: 170px;
            border:1px solid red;
            margin:200px auto;
            overflow: hidden;
        }
        img{
            width: 100%;
        }
        a{
            position: absolute;
            top: 50%;
            margin-top: -20px;
            width: 60px;
            height: 40px;
            line-height: 40px;
            text-align: center;
            background-color: #333;
            color: #eee;
            opacity: 0;
        }
        .pageup{
            left: 0;
        }
        .pagedown{
            right: 0;
        }
    </style>

</head>
<body>

    <div id="app">
        <ul>
            <li><img src="images/11784_sjvz_6183.jpg" alt=""></li>
            <li><img src="images/11975_9qds_7354.jpg
            " alt=""></li>
            <li><img src="images/12316_83da_5472.jpg" alt=""></li>
//图片会有缩放的感觉
        </ul>
        <a href="###" class="pageup">上一页</a>
        <a href="###" class="pagedown">下一页</a>
    </div>

<script src="js/jquery.1.11.3.min.js"></script>
<script>
    var t;

    function slider(){
        $("ul").animate({
            "margin-top":"-170px"
        },600,function(){
            $("li").eq(0).appendTo($(this));
            $(this).css("margin-top",0)
        })
    }

    function move(){
        t = setInterval(function(){
            slider();
        },2000)
    }

    move();

    $("#app")
        .on("mouseenter",function(){
            clearInterval(t)
            $("a").animate({
                "opacity":1
            },600)
        })
        .on("mouseleave",function(){
            move();
            $("a").animate({
                "opacity":0
            },600)
        })
    
    $(".pageup")
        .on("click",function(){
            slider();
        })

    $(".pagedown")
        .on("click",function(){
            $("li").eq(2).prependTo($("ul"));
            $("ul").css("margin-top","-170px")
                .animate({
                    "margin-top":"0"
                },600)
        })
</script>

</body>
</html>

单行图片向上滚动

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