用JS写的无缝滚动特效

时间：2022-05-09 20:53:00

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);

}

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