前端开发信息滚动效果制作

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思路:con1内容不够要加con2; con2.innerHTML=con1.innHTML
当con1内容离开了div的时候con1恢复到初始状态。
con1滚动的距离area.scrollTop
con1的高度con1.offsetHeight

html 代码

<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
<html xmlns=”http://www.w3.org/1999/xhtml”>
    <head>
        <meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″ />
        <title>向上无缝滚动</title>
        <style>
            body {
                font-size: 12px;
                line-height: 24px;
                text-algin: center; /* 页面内容居中 */
            }
            * {
                margin: 0px;
                padding: 0px; /* 去掉所有标签的marign和padding的值 */
            }
            ul {
                list-style: none; /* 去掉ul标签默认的点样式 */
            }
            a img {
                border: none; /* 超链接下,图片的边框 */
            }
            a {
                color: #333;
                text-decoration: none; /* 超链接样式 */
            }
            a:hover {
                color: #ff0000;
            }
            #mooc {
                width: 399px;
                border: 5px solid #ababab;
                -moz-border-radius: 15px; /* Gecko browsers */
                -webkit-border-radius: 15px; /* Webkit browsers */
                border-radius: 15px;
                box-shadow: 2px 2px 10px #ababab;
                margin: 50px auto 0;
                text-align: left; /* 让新闻内容靠左 */
            }
            /* 头部样式 */
            #moocTitle {
                height: 62px;
                overflow: hidden; /* 这个一定要加上,内容超出的部分要隐藏,免得撑高头部 */
                font-size: 26px;
                line-height: 62px;
                padding-left: 30px;
                background-image: -moz-linear-gradient(
                    top,
                    #f05e6f,
                    #c9394a
                ); /* Firefox */
                background-image: -webkit-gradient(
                    linear,
                    left top,
                    left bottom,
                    color-stop(0, #f05e6f),
                    color-stop(1, #c9394a)
                ); /* Saf4+, Chrome */
                filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=’#8fa1ff’, endColorstr=’#f05e6f’, GradientType=’0′); /* IE*/
                border: 1px solid ##f05e6f;
                -moz-border-radius: 8px 8px 0 0; /* Gecko browsers */
                -webkit-border-radius: 8px 8px 0 0; /* Webkit browsers */
                border-radius: 8px 8px 0 0;
                color: #fff;
                position: relative;
            }
            #moocTitle a {
                position: absolute;
                right: 10px;
                bottom: 10px;
                display: inline;
                color: #fff;
                font-size: 12px;
                line-height: 24px;
            }
            /* 底部样式 */
            #moocBot {
                width: 399px;
                height: 10px;
                overflow: hidden; /* 这个一定要加上,内容超出的部分要隐藏,免得撑高底部结构 */
            }
            /* 中间样式 */
            #moocBox {
                height: 144px;
                width: 335px;
                margin-left: 25px;
                margin-top: 10px;
                overflow: hidden; /* 这个一定要加,超出的内容部分要隐藏,免得撑高中间部分 */
            }
            #mooc ul li {
                height: 24px;
            }
            #mooc ul li a {
                width: 180px;
                float: left;
                display: block;
                overflow: hidden;
                text-indent: 15px;
                height: 24px;
            }
            #mooc ul li span {
                float: right;
                color: #999;
            }
        </style>
    </head>
    <body>
        <!– 慕课网课程公告开始 –>
        <div id=”mooc”>
            <!– 头部 –>
            <h3 id=”moocTitle”>
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            </h3>
            <!– 头部结束 –>
            <!– 中间 –>
            <div id=”moocBox”>
                <ul id=”con1″>
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                </ul>
                <ul id=”con2″></ul>
            </div>
            <!– 中间结束 –>
        </div>
        <!– 慕课网课程公告结束 –>
        <script type=”text/javascript”>
            var area = document.getElementById(‘moocBox’)
            var con1 = document.getElementById(‘con1’)
            var con2 = document.getElementById(‘con2’)
            var speed = 50
            area.scrollTop = 0
            con2.innerHTML = con1.innerHTML
            function scrollUp() {
                if (area.scrollTop >= con1.scrollHeight) {
                    area.scrollTop = 0
                } else {
                    area.scrollTop++
                }
            }
            var myScroll = setInterval(‘scrollUp()’, speed)
            area.onmouseover = function() {
                clearInterval(myScroll)
            }
            area.onmouseout = function() {
                myScroll = setInterval(‘scrollUp()’, speed)
            }
        </script>
    </body>
</html>
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