WEB前端：05_scroll滚动(图片/文字滚动)

浏览数：23 / 时间：2015年06月09日

scroll滚动(图片/文字滚动)

网站常用效果之一，以下为简化版，用于学习javascript基础知识。

效果图：

scroll滚动(图片/文字滚动)- 纯JS简化版

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<html>
<head>
<meta http-equiv="Content-Type" 
content="text/html; charset=utf-8">
<title>scroll滚动 - 纯js简化版</title>
<style type="text/css">
*{margin: 0; padding: 0;}
#probox{ position: relative; border: 1px solid #ccc; width:1000px;overflow:hidden;height:120px; margin: 10px auto;}
#prolist{ position: relative; width:2000px; height: 120px; list-style: none; margin: 0; padding: 0;}
#prolist li {float: left; width: 250px; height: 120px; text-align: center;}
#left,#right{ background: #333; color: #fff; padding: 5px; cursor:pointer;}
</style>
<script type="text/javascript">
window.onload = function() {
    var 
probox = document.getElementById(‘probox‘);
    var 
prolist = document.getElementById(‘prolist‘);
    var 
prolistli = prolist.getElementsByTagName(‘li‘);
    var 
btnleft = document.getElementById(‘left‘);
    var 
btnright = document.getElementById(‘right‘);
 
    var 
cut = prolistli[1].offsetLeft - prolistli[0].offsetLeft;
    var 
len = prolist.offsetLeft;
    var 
timer = null;
 
    function 
autoplay() {
        if(timer) {
            clearInterval(timer);
        }
        timer = setInterval(function() {
            if(prolist.offsetLeft == -cut) {
                clearInterval(timer);
                prolist.appendChild(prolistli[0]);
                prolist.style.left = "0px";
            } else 
{
                prolist.style.left = prolist.offsetLeft - 10 + "px";
            }
        }, 30)
    }
 
    probox.onmouseover = function() {
        clearInterval(o);
    }
 
    probox.onmouseout = function() {
        o = setInterval(autoplay, 3000);
    }
 
    btnleft.onclick = function() {
        clearInterval(o);
        if(timer) {
            clearInterval(timer);
        }
         
        timer = setInterval(function() {
            if(prolist.offsetLeft == 0) {
                clearInterval(timer);
                prolist.insertBefore(prolistli[prolistli.length - 1], prolist.firstChild);
                prolist.style.left = -cut + "px";
            } else 
{
                prolist.style.left = prolist.offsetLeft + 10 + "px";
            }
        }, 30);
 
        o = setInterval(autoplay, 3000);
    }
 
    btnright.onclick = function() {
        clearInterval(o);
        if(timer) {
            clearInterval(timer);
        }
        timer = setInterval(function() {
            if(prolist.offsetLeft == -cut) {
                clearInterval(timer);
                prolist.appendChild(prolistli[0]);
                prolist.style.left = "0px";
            } else 
{
                prolist.style.left = prolist.offsetLeft - 10 + "px";
            }
        }, 30);
 
        o = setInterval(autoplay, 3000);
    }
 
    o = setInterval(autoplay, 3000);
 
}
</script>
</head>
<body>
 
<div id="probox">
    <ul id="prolist">
        <li><img src="tab1.jpg" 
width="220" 
height="120" 
/></li>
        <li><img src="tab2.jpg" 
width="220" 
height="120" 
/></li>
        <li><img src="tab3.jpg" 
width="220" 
height="120" 
/></li>
        <li><img src="tab4.jpg" 
width="220" 
height="120" 
/></li>
        <li><img src="tab5.jpg" 
width="220" 
height="120" 
/></li>
        <li><img src="tab6.jpg" 
width="220" 
height="120" 
/></li>
        <li><img src="tab7.jpg" 
width="220" 
height="120" 
/></li>
        <li><img src="tab8.jpg" 
width="220" 
height="120" 
/></li>
    </ul>
</div>
<span id="left">上一个</span> <span id="right">下一个</span>
 
</body>
</html>