用JS写的无缝滚动特效

 

代码如下

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title></title>
    <link rel="stylesheet" href="">
    <script type="text/javascript" src="js/common.js"></script>
    <style type="text/css">
        body,div,ul,li,img{padding:0;margin:0;}
        #main{width:800px;height:200px; border:1px solid #666; margin:0px auto; position:relative;overflow: hidden;}
        #main ul{position:absolute; left:0;}
        #main li{list-style: none;float:left; }
        #top{width:800px; text-align: center;margin:50px auto 0px;}
    </style>

    <script type="text/javascript">
        window.onload = function(){
            var main = $('main');
            var speed = -3;
            var oUl = main.getElementsByTagName('ul')[0];

            var aLeft = $('top').getElementsByTagName('a')[0];
            var aRight = $('top').getElementsByTagName('a')[1];
            oUl.style.width  = oUl.clientWidth*2 + 'px';
            oUl.innerHTML += oUl.innerHTML;
            //向左移动
            var timer = setInterval(move,30);

            //点击向左的时候，减去3px
            aLeft.onclick = function(){
                speed = -3;
            }
            //点击向右的时候,加上3px
            aRight.onclick = function(){
                speed = 3;
            }
            //鼠标
            main.onmouseover = function(){
                clearInterval(timer);
            }

            main.onmouseout = function(){
                clearInterval(timer);
                timer = setInterval(move,30);
            }

            function move(){
                if (oUl.offsetLeft < -main.clientWidth) {
                      oUl.style.left = 0;
                } else if(oUl.offsetLeft >= 0) {
                    oUl.style.left = -main.clientWidth + 'px';
                }
                oUl.style.left = oUl.offsetLeft + speed + 'px';
            }
        }
    </script>
</head>
<body>
    <div id="top">
        <a href="javascript:;">向左</a>
        <a href="javascript:;">向右</a>
    </div>
    <div id="main">
        <ul>
            <li><img src="img/1.jpg" alt=""></li>
            <li><img src="img/2.jpg" alt=""></li>
            <li><img src="img/3.jpg" alt=""></li>
            <li><img src="img/4.jpg" alt=""></li>
        </ul>
    </div>
</body>
</html>

common.js

function $(id){
    return document.getElementById(id);
}

 

posted @ 2016-09-25 22:39  小码农薛尧  阅读(156)  评论(0)  编辑  收藏  举报
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