js仿百度有啊通栏展示效果实现代码

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我是靠谱客的博主凶狠龙猫，最近开发中收集的这篇文章主要介绍js仿百度有啊通栏展示效果实现代码，觉得挺不错的，现在分享给大家，希望可以做个参考。
概述

效果图如下：

页面代码：
复制代码代码如下:
 
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<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>百度有啊通栏展示效果</title> 
<style type="text/css"> 
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body{color:#333;font:12px/1.5 arial;} 
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#container{position:relative;height:232px;background:#FCFCFC;} 
#container .item{position:absolute;top:0;left:0;width:492px;height:230px;overflow:hidden;background:#FAFAFA;border:1px solid #ddd;z-index:1;opacity:1;} 
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#container .item .txt dt{font-size:14px;font-weight:700;} 
#container .item .txt .info{color:#999;} 
#container .item .txt dd{height:24px;line-height:24px;} 
#container .item .txt dd span{float:left;} 
#container .item .txt .star{position:relative;float:left;height:12px;width:69px;margin:6px 0 0 5px;} 
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#container .item .txt .green{background:#9CDBC3;} 
#container .item .txt .comment{width:232px;height:99px;margin-top:10px;background:#FFF;border:1px solid #EAEAEA;} 
#container .item .txt .comment h3{font-size:12px;font-weight:400;height:24px;line-height:24px;border-bottom:1px solid #E9E9E9;padding:0 10px;} 
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#container .item .txt .comment .comment_list ul{width:220px;} 
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#container .item .txt .comment .comment_list ul li b{color:#999;font-weight:400;} 
#control{height:37px;text-align:center;background:url(http://js.fgm.cc/learn/lesson10/img/youa/bg.png) no-repeat;} 
#control span{width:8px;height:8px;font-size:0;line-height:0;cursor:pointer;display:inline-block;background-color:#FEFEFE;border:1px solid #BCC1C5;margin:13px 2px 2px;} 
#control span.active{background-color:#848484;border:1px solid #6E6E6E;} 
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function Youa (obj) 
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this.control = $("control"); 
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this.iCenter = 2; 
this.aSort = []; 
this.timer = null; 
this.oData = [ 
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{left:124, zIndex:4, opacity:100}, 
{left:208, zIndex:3, opacity:60}, 
{left:246, zIndex:2, opacity:30}, 
{left:40, zIndex:0, opacity:0} 
]; 
this.__create__() 
}; 
Youa.prototype.__create__ = function () 
{ 
var that = this; 
var oSpan = null; 
var i = 0; 
for (i = 0; i < that.items.length; i++) 
{ 
that.items[i].number = i; 
that.aSort[i] = that.items[i]; 
oSpan = document.createElement("span"); 
oSpan.number = i; 
that.control.appendChild(oSpan) 
} 
for (i = 0; i < 2; i++) this.aSort.unshift(this.aSort.pop()); 
that.aSpan = $$("span", that.control); 
that.control.onmouseover = function (ev) 
{ 
var oEv = ev || event; 
var oTarget = oEv.target || oEv.srcElement; 
if (oTarget.tagName.toUpperCase() == "SPAN") 
{ 
that.aSort.sort(function (a, b) {return a.number - b.number}); 
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that.__set__(); 
return false 
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for (i = 0; i < oTarget.number - that.iCenter; i++) that.aSort.push(that.aSort.shift()); 
that.__set__(); 
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that.__set__() 
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this.__set__(); 
this.__switch__(); 
this.__autoPlay__() 
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Youa.prototype.__set__ = function () 
{ 
var i = 0; 
for (i = 0; i < this.aSort.length; i++) this.container.appendChild(this.aSort[i]); 
for (i = 0; i < this.aSpan.length; i++) this.aSpan[i].className = ""; 
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Youa.prototype.__switch__ = function () 
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var i = 0; 
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this.container.onclick = function (ev) 
{ 
var oEv = ev || event; 
var oTarget = oEv.target || oEv.srcElement; 
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if (index < that.iCenter) 
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for (i = 0; i < that.iCenter - index; i++) that.aSort.unshift(that.aSort.pop()); 
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for (i = 0; i < index - that.iCenter; i++) that.aSort.push(that.aSort.shift()); 
that.__set__(); 
return false 
} 
function findItem (element) 
{ 
return element.className == "item" ? element.index : arguments.callee(element.parentNode) 
} 
}; 
}; 
Youa.prototype.__autoPlay__ = function () 
{ 
var that = this; 
that.timer = setInterval(function () 
{ 
that.aSort[3].click() 
}, 3000); 
that.obj.onmouseover = function () 
{ 
clearInterval(that.timer) 
}; 
that.obj.onmouseout = function () 
{ 
that.timer = setInterval(function () 
{ 
that.aSort[3].click() 
}, 3000) 
} 
}; 
function $ (id) 
{ 
return typeof id === "string" ? document.getElementById(id) : id 
}; 
function $$ (tagName, oParent) 
{ 
return (oParent || document).getElementsByTagName(tagName) 
}; 
function $$$ (className, element, tagName) 
{ 
var i = 0; 
var aClass = []; 
var reClass = new RegExp("(^|//s)" + className + "(//s|$)"); 
var aElement = $$(tagName || "*", element || document); 
for (i = 0; i < aElement.length; i++) reClass.test(aElement[i].className) && aClass.push(aElement[i]); 
return aClass 
}; 
function css (element, attr, value) 
{ 
if (arguments.length == 2) 
{ 
if (typeof arguments[1] === "string") 
{ 
return element.currentStyle ? element.currentStyle[attr] : getComputedStyle(element, null)[attr] 
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{ 
property == "opacity" ? 
(element.style.filter = "alpha(opacity=" + attr[property] + ")", element.style.opacity = attr[property] / 100) : 
element.style[property] = attr[property] 
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switch (attr) 
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case "width": 
case "height": 
case "top": 
case "left": 
case "right": 
case "bottom": 
element.style[attr] = value + "px"; 
break; 
case "opacity" : 
element.style.filter = "alpha(opacity=" + value + ")"; 
element.style.opacity = value / 100; 
break; 
default : 
element.style[attr] = value; 
break 
} 
} 
return element 
}; 
function Animate (element, options, fnCallBack) 
{ 
this.obj = $(element); 
this.options = options; 
this.__onEnd__ = fnCallBack; 
this.__startMove__() 
}; 
Animate.prototype.__startMove__ = function () 
{ 
var that = this; 
clearInterval(that.obj.timer); 
that.obj.timer = setInterval(function () 
{ 
that.__doMove__() 
}, 30); 
}; 
Animate.prototype.__doMove__ = function () 
{ 
var complete = true; 
var property = null; 
for (property in this.options) 
{ 
var iCur = parseFloat(css(this.obj, property)); 
property == "opacity" && (iCur = parseInt(iCur.toFixed(2) * 100)); 
var iSpeed = (this.options[property] - iCur) / 5; 
iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed); 
this.options[property] == iCur || (complete = false, css(this.obj, property, iSpeed + iCur)) 
} 
complete && (clearInterval(this.obj.timer), this.__onEnd__ && this.__onEnd__.apply(this.obj)) 
}; 
window.onload = function () 
{ 
new Youa("box") 
}; 
</script> 
</head> 
<body> 
<div id="box"> 
<div id="container"> 
<div class="item"> 
<div class="pic"> 
<a href="javascript：;"><img src="http://js.fgm.cc/learn/lesson10/img/youa/1.jpg" /></a> 
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<dd><span>用户印象：</span><span class="pink">过瘾</span><span class="blue">带劲</span><span class="green">有活力</span></dd> 
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<li><b>爱情赛车：</b>白天人很少，喜欢安静...</li> 
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<dd><span>用户印象：</span><span class="pink">真好</span><span class="blue">专业</span><span class="green">手法好</span></dd> 
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<h3>用户评价</h3> 
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<li><b>白云寺方丈：</b>我不会打台球，但朋友...</li> 
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<div class="pic"> 
<a href="javascript：;"><img src="http://js.fgm.cc/learn/lesson10/img/youa/6.jpg"></a> 
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<h3>用户评价</h3> 
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<ul id="list"> 
<li><b>janice19891：</b>很负责任~</li> 
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<h3>用户评价</h3> 
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