无缝滚动改进版支持上下左右滚动（封装成函数）

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我是靠谱客的博主深情冰棍，最近开发中收集的这篇文章主要介绍无缝滚动改进版支持上下左右滚动（封装成函数），觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

复制代码代码如下:

<!DOCTYPE HTML>
<html lang="en-US">
<head>
    <meta charset="UTF-8">
    <title>无缝滚动——上下</title>
    <style type="text/css">
    *{margin:0;padding:0;}
    li{list-style:none;}
    img{border:0;}
    #scroll{width:178px;margin:50px auto;position:relative;}
    .btn{display:block;width:27px;height:27px;position:absolute;left:75px;}
    .up{background:url(images/up.gif);top:0;}
    .down{background:url(images/down.gif);top:490px;}
    .content{height:440px;overflow:hidden;position:relative;top:40px;}
    .content ul{position:absolute;top:0;left:0;}
    .content li{height:110px;}
    </style>
</head>
<body>
    <div id="scroll">
        <a href="javascript：;" class="btn up"></a>
        <a href="javascript：;" class="btn down"></a>
        <div class="content">
            <ul>
                <li><a href="#" title="111"><img src="images/1.jpg" alt="111" width="178" height="108"/></a></li>
                <li><a href="#" title="222"><img src="images/2.jpg" alt="222" width="178" height="108"/></a></li>
                <li><a href="#" title="333"><img src="images/3.jpg" alt="333" width="178" height="108"/></a></li>
                <li><a href="#" title="444"><img src="images/4.jpg" alt="444" width="178" height="108"/></a></li>
            </ul>
        </div>
    </div>
</body>
</html>
<script type="text/javascript" src="scroll.js"></script>
<script type="text/javascript">
window.onload = function(){
    scroll('top',1,1000);
};
</script>            

scroll.js：

复制代码代码如下:

/**********
    功能：实现水平或垂直无缝滚动
    参数：direction方向，总共4个值：left,right,top,bottom
          speed移动距离
          iTime多少时间后开始移动，若不写则页面加载完开始移动
**********/
function scroll(direction,speed,iTime){
    var oDiv = document.getElementById('scroll');
    var oUl = oDiv.getElementsByTagName('ul')[0];
    var aLi = oDiv.getElementsByTagName('li');
    var aBtn = oDiv.getElementsByTagName('a');
    var timer = null;
    var iSpeed = 0;
    var flag = true;    //判断水平移动还是垂直移动

    oUl.innerHTML += oUl.innerHTML;

    switch(direction){
        case 'left':
            iSpeed = -speed;
            oUl.style.width = aLi[0].offsetWidth * aLi.length + 'px';
            flag = true;
            break;
        case 'right':
            iSpeed = speed;
            oUl.style.width = aLi[0].offsetWidth * aLi.length + 'px';
            flag = true;
            break;
        case 'top':
            iSpeed = -speed;
            flag = false;
            break;
        case 'bottom':
            iSpeed = speed;
            flag = false;
            break;
    };

    setTimeout(move,iTime);

    //左按钮和上按钮
    aBtn[0].onclick = function(){
        clearInterval(timer);
        iSpeed = -speed;
        move();
    };

    //右按钮和下按钮
    aBtn[1].onclick = function(){
        clearInterval(timer);
        iSpeed = speed;
        move();
    };

    oUl.onmouseover = function(){
        clearInterval(timer);
    };

    oUl.onmouseout = function(){
        move();
    };

    function move(){    
        timer = setInterval(function(){
            if(flag){
                oUl.style.left = oUl.offsetLeft + iSpeed + 'px';
                if(oUl.offsetLeft < -oUl.offsetWidth / 2){
                    oUl.style.left = '0';
                }else if(oUl.offsetLeft > 0){
                    oUl.style.left = - oUl.offsetWidth / 2 + 'px';
                }
            }else{
                oUl.style.top = oUl.offsetTop + iSpeed + 'px';
                if(oUl.offsetTop <= - oUl.offsetHeight / 2){
                    oUl.style.top = '0';
                }else if(oUl.offsetTop >= 0){
                    oUl.style.top = - oUl.offsetHeight / 2 + 'px';
                };
            };
        },30);
    };
};