在一文中我们实现了用jquery来实现一种较为华丽的网站信息或公告的上下滚动，本文介绍一种用javascript代码实现的上下循环滚动，滚动时还能让被显示的第一条信息渐现效果。(在dscuzX2中工作，请看下文演示，不知道在wordpress中是否正常)

<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>

<script type="text/javascript">

new slider({id:'slider'})

</script>

你要做的就是在你想要该效果的地方增加<ul id="slider"><li>要滚动的信息</li></ul>