JS实现新浪微博大厅滚动tweets-slide

<!doctype html>
    <html>
    <head>
    <title>JS实现新浪微博大厅滚动tweets-slide丨石家庄电缆附件|石家庄常山陵园</title>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
    <style type="text/css">
    ul, li {margin:0; padding:0;list-style:none}
    body {
    margin: 0;
    height: 100%;
    background: #333;
    }
    .wp {
    position: relative;
    width: 800px;
    height: 400px;
    overflow: hidden;
    margin: 20px auto;
    border: 4px solid #121212;
    background: #fff;
    }
    .slider {
    position: absolute;
    width: 760px;
    padding: 0 20px;
    left:0;
    top: 0;
    }
    .fl {float:left}
    .slider img {display:block; padding: 2px; border: 1px solid #ccc}
    .slider li {padding: 20px 0; border-bottom: 1px dashed #ccc;overflow:hidden;width:100%}
    .slider p {font-size: 12px;margin:0;padding-left:68px;color:#333;line-height:20px;}
    </style>
    <script type="text/javascript">
    function H$(i) {return document.getElementById(i)}
    function H$$(c, p) {return p.getElementsByTagName(c)}
    var slider = function () {
    function init (o) {
    this.id = o.id;
    this.at = o.auto ? o.auto : 3;
    this.o = 0;
    this.pos();
    }
    init.prototype = {
    pos : function () {
    clearInterval(this.__b);
    this.o = 0;
    var el = H$(this.id), li = H$$('li', el), l = li.length;
    var _t = li[l-1].offsetHeight;
    var cl = li[l-1].cloneNode(true);
    cl.style.opacity = 0; cl.style.filter = 'alpha(opacity=0)';
    el.insertBefore(cl, el.firstChild);
    el.style.top = -_t + 'px';
    this.anim();
    },
    anim : function () {
    var _this = this;
    this.__a = setInterval(function(){_this.animH()}, 20);
    },
    animH : function () {
    var _t = parseInt(H$(this.id).style.top), _this = this;
    if (_t >= -1) {
    clearInterval(this.__a);
    H$(this.id).style.top = 0;
    var list = H$$('li',H$(this.id));
    H$(this.id).removeChild(list[list.length-1]);
    this.__c = setInterval(function(){_this.animO()}, 20);
    //this.auto();
    }else {
    var __t = Math.abs(_t) - Math.ceil(Math.abs(_t)*.07);
    H$(this.id).style.top = -__t + 'px';
    }
    },
    animO : function () {
    this.o += 2;
    if (this.o == 100) {
    clearInterval(this.__c);
    H$$('li',H$(this.id))[0].style.opacity = 1;
    H$$('li',H$(this.id))[0].style.filter = 'alpha(opacity=100)';
    this.auto();
    }else {
    H$$('li',H$(this.id))[0].style.opacity = this.o/100;
    H$$('li',H$(this.id))[0].style.filter = 'alpha(opacity='+this.o+')';
    }
    },
    auto : function () {
    var _this = this;
    this.__b = setInterval(function(){_this.pos()}, this.at*1000);
    }
    }
    return init;
    }();
    </script>
    </head>
    <body>
    <div class="wp">
    <ul id="slider" class="slider">
    <li><a class="fl" href="javascript:;"><img src="/images/s1.jpg" width=48px height=48px alt="" /></a>
    <p>曾虑多情损梵行
    　　
    入山又恐别倾城
    　　
    世间安得双全法
    　　
    不负如来不负卿</p>
    </li>
    <li><a class="fl" href="javascript:;"><img src="/images/s1.jpg" width=48px height=48px alt="" /></a>
    <p>第一最好不相见，如此便可不相恋。
    第二最好不相知，如此便可不相思。<br/>
    第三最好不相伴，如此便可不相欠。
    第四最好不相惜，如此便可不相忆。<br/>
    第五最好不相爱，如此便可不相弃。
    </li>
    <li><a class="fl" href="javascript:;"><img src="/images/s1.jpg" width=48px height=48px alt="" /></a>
    <p>源码爱好者提供各类编程源码、书籍教程、JavaScript/CSS特效代码。<br/>以及常用软件下载等，做有质量的学习型源码下载站。</p>
    </li>
    <li><a class="fl" href="javascript:;"><img src="/images/s1.jpg" width=48px height=48px alt="" /></a>
    <p>今天天气不错，我们都出来郊游了，可不一会就下起了雨，都淋湿了，但心情很爽噢。<br/>必竟我们不怎么出来玩，一出来就碰到了雨，很荣幸哦！</p>
    </li>
    </ul>
    </div>
    <script type="text/javascript">
    new slider({id:'slider'})
    </script>
    </body>
    </html>
JS实现新浪微博大厅滚动tweets-slide

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