本文实例为大家分享了js实现文字无缝轮播的具体代码，供大家参考，具体内容如下
所用到的知识点：
innerHTML 获取或设置某个对象的内容
scrollTop 滚动条滚动的距离，此属性是系统内置定义好的
offsetHeight 获取或设置对象的高度
setInterval() 开启定时器
clearInterval() 关闭定时器
html布局结构如下：
其中con2是用来储存复制con1内容的容器
<body>
<div id="mooc">
<!-- 头部 -->
<h3 id="moocTitle">最新课程<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" target="_self">更多>></a> </h3>
<!-- 头部结束 -->
<!-- 中间 -->
<div id="moocBox">
<ul id="con1">
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >1.学会html5 绝对的逆袭（案例）</a><span>2013-09-18</span></li>
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >2.tab页面切换效果（案例）</a><span>2013-10-09</span></li>
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >3.圆角水晶按钮制作（案例）</a><span>2013-10-21</span></li>
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<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >5.分页页码制作（案例）</a><span>2013-11-06</span></li>
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >6.导航条菜单的制作（案例）</a><span>2013-11-08</span></li>
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >7.信息列表制作(案例)</a><span>2013-11-15</span></li>
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<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >9.如何实现“新手引导”效果</a><span>2013-12-06</span></li>
</ul>
<ul id="con2">
</ul>
</div>
<!-- 中间结束 -->
</div>
</body>
css样式如下：
<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>
js代码如下：
<script>
var area=document.getElementById('moocBox');
area.scrollTop=0;//scrollTop初始化对象滚动条的距离，此属性是系统标准化的
//获取第一个ul对象
var con1=document.getElementById('con1');
//获取第二个ul对象
var con2=document.getElementById('con2');
//将第一个ul对象里的内容给第二个ul对象
con2.innerHTML=con1.innerHTML;
//封装函数 用来判断滚动条的距离与盒子高度的关系
function scrollUp(){
if(area.scrollTop>=con1.offsetHeight){
area.scrollTop=0;
}else{
area.scrollTop++;
}
}
//声明定时器
var timer=null;
//解决暴力用户 在开启定时器之前最好先清除一下定时器
clearInterval(timer);
//开始定时器
timer=setInterval(scrollUp,50);
//为对象设置绑定鼠标滑过
area.onmouseover=function(){
clearInterval(timer);
}
//为对象绑定鼠标划出
area.onmouseout=function(){
timer=setInterval(scrollUp,50);
}
</script>
