js實現無縫輪播

本文實例為大傢分享瞭js實現文字無縫輪播的具體代碼,供大傢參考,具體內容如下

所用到的知識點:

innerHTML 獲取或設置某個對象的內容
scrollTop 滾動條滾動的距離,此屬性是系統內置定義好的
offsetHeight 獲取或設置對象的高度
setInterval() 開啟定時器
clearInterval() 關閉定時器

html佈局結構如下:

其中con2是用來儲存復制con1內容的容器

<body>

<div  id="mooc"> 
<!--  頭部 -->
<h3 id="moocTitle">最新課程<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>
<!--  頭部結束 --> 
<!--  中間 -->
<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.學會html5 絕對的逆襲(案例)</a><span>2013-09-18</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.分頁頁碼制作(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.導航條菜單的制作(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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    </ul>
    <ul id="con2">
    </ul>
</div>
<!--  中間結束 --> 
</div>

</body>

css樣式如下:

<style>
body {
    font-size: 12px;
    line-height: 24px;
    text-algin: center;        /* 頁面內容居中 */
}
* {
    margin: 0px;
    padding: 0px;            /*  去掉所有標簽的marign和padding的值  */
}
ul {
    list-style: none;           /*  去掉ul標簽默認的點樣式  */
}
a img {
    border: none;        /*  超鏈接下,圖片的邊框  */
}
a {
    color: #333;
    text-decoration: none;     /* 超鏈接樣式 */
}
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;               /* 讓新聞內容靠左 */
}
/*  頭部樣式 */ 
#moocTitle {
    height: 62px;
    overflow: hidden;  /* 這個一定要加上,內容超出的部分要隱藏,免得撐高頭部 */
    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;
}
/*  底部樣式 */
#moocBot {
    width: 399px;
    height: 10px;
    overflow: hidden;     /* 這個一定要加上,內容超出的部分要隱藏,免得撐高底部結構 */
}
/*  中間樣式 */
#moocBox {
    height: 144px;
    width: 335px;
    margin-left: 25px;
    margin-top: 10px;
    overflow: hidden;    /*  這個一定要加,超出的內容部分要隱藏,免得撐高中間部分 */
}
#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代碼如下:

<script>
    var area=document.getElementById('moocBox');
    area.scrollTop=0;//scrollTop初始化對象滾動條的距離,此屬性是系統標準化的
    //獲取第一個ul對象
    var con1=document.getElementById('con1');
    //獲取第二個ul對象
    var con2=document.getElementById('con2');
    //將第一個ul對象裡的內容給第二個ul對象
    con2.innerHTML=con1.innerHTML;
    //封裝函數 用來判斷滾動條的距離與盒子高度的關系
    function scrollUp(){
        if(area.scrollTop>=con1.offsetHeight){
            area.scrollTop=0;
        }else{
            area.scrollTop++;
        }
    }
    //聲明定時器
    var timer=null;
    //解決暴力用戶 在開啟定時器之前最好先清除一下定時器
    clearInterval(timer);
    //開始定時器
    timer=setInterval(scrollUp,50);

    //為對象設置綁定鼠標滑過
    area.onmouseover=function(){
        clearInterval(timer);
    }
    //為對象綁定鼠標劃出
    area.onmouseout=function(){
        timer=setInterval(scrollUp,50);
    }
</script>

以上就是本文的全部內容,希望對大傢的學習有所幫助,也希望大傢多多支持WalkonNet。

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