【js特效】www.zhen.com首页特效
1.效果如下：
2.html文件
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<title></title>
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" / >
<style type="text/css">
/* 初始化CSS */
html, body, ul, li, ol, dl, dd, dt, p, h1, h2, h3, h4, h5, h6, form, fieldset, legend, img { margin:0; padding:0; }
fieldset, img { border:none; }
address, caption, cite, code, dfn, th, var { font-style:normal; font-weight:normal; }
ul, ol { list-style:none; }
select, input { vertical-align:middle; }
select, input, textarea { font-size:12px; margin:0; }
table { border-collapse:collapse; }
body { background:#fff; color:#333; padding:0; font:12px/20px "宋体"; }
.clearfix:after { content:"."; display:block; height:0; visibility:hidden; clear:both; }
.clearfix { zoom:1; }
.clearit { clear:both; height:0; font-size:0; overflow:hidden; }
a { color:#009; text-decoration:none; }
a:visited { color:#800080; }
a:hover, a:active, a:focus { color:#f00; text-decoration:underline; }
.part { border:solid 1px #E3DFDB; border-top:none; overflow:hidden; height:308px; position:relative }
.part .p_cont { position:relative}
.tit { border-top:solid 3px #5E2325; background:url(http://i1.sinaimg.cn/lx/deco/2010/1008/style/style_zxh_0905_04.png) no-repeat 0 -1250px; height:40px; }
.tit h2 { background:url(http://i1.sinaimg.cn/lx/deco/2011/0524/style_zxh_0513_title.png) no-repeat 10px 10px; width:160px; float:left; height:36px; text-indent:-999em }
#scrollBox { margin:10px auto 0 }
#scrollBox img { display:block}
.tit .more { float:right; padding:16px 20px 0 0 }
.tit h2 a { display:block; cursor:pointer; height:36px;}
.arrleft, .arrright{background:url(http://i2.sinaimg.cn/lx/deco/2010/0706/style/arrow.png) no-repeat; position:absolute; cursor:pointer; line-height:200px; width:18px; height:34px; overflow:hidden; display:block; outline:none; left:10px ; top:131px;}
.arrleft:hover{background-position:0 -48px}
.arrright{background-position:-34px 0; left:670px;}
.arrright:hover{background-position:-34px -48px}
.piclist{ padding:3px; border:solid 1px #ccc; background:#fff }
.title { text-align:center; color:#fff;margin-top:-30px; line-height:30px; position:relative; overflow:hidden; height:30px;width:100%;}
.bg { background:#000; filter:alpha(opacity=60); opacity:0.6; margin-top:-30px; height:30px;width:100%;}
.picdesc{ display:none}
</style>
<script>
/*
version : 1.0
方法：
go(index)：将指定序号滚动到中间，序号从0开始
setIndex(index)：将指定序号跳转到中间，无动画，序号从0开始
setLeftIndex(index)：将指定序号跳转到最左边，无动画，序号从0开始
pre()：向前滚动一张
next()：向后滚动一张
init()：初始化
HTML代码结构说明：
为了网站的SEO效果，图片数据，描述信息等均放置到HTML代码中，其结构如下：
<img src=""/>
<div>这里放置对前一张图片的描述信息</div>
<img src=""/>
<div>这里放置对前一张图片的描述信息</div>
如果图片有链接，则需要给图片添加上<a>标签，如下所示：
<a href="" target=""><img src=""/></a>
<div>这里放置对前一张图片的描述信息</div>
<img src=""/>
<div>这里放置对前一张图片的描述信息</div>
可以参考相关示例DEMO文件
*/
(function(){
var sina = {
$ : function(objName){if(document.getElementById){return eval('document.getElementById("'+objName+'")')}else{return eval('document.all.'+objName)}},
//Event
addEvent : function(obj,eventType,func){if(obj.attachEvent){obj.attachEvent("on" + eventType,func);}else{obj.addEventListener(eventType,func,false)}},
delEvent : function(obj,eventType,func){
if(obj.detachEvent){obj.detachEvent("on" + eventType,func)}else{obj.removeEventListener(eventType,func,false)}
},
// 获取下一个非空节点
next : function(el){
var next = el.nextSibling;
while(next && next.nodeType != 1){
next = next.nextSibling;
}
return next;
},
extend : function(o,t){
for (var p in t){
o[p] = t[p];
}
return o;
},
/**
* 设置元素的css样式
*/
css : function(o,s){
var t = o.style;
for (var p in s){
t[p] =s[p];
}
return o;
},
getCurrIndex : function(len,curr){
if(curr >= len)
curr -= len;
if(curr <0)
curr += len;
return curr;
},
// 获取数组的某个元素
getArrEl : function(arr,curr){
return arr[this.getCurrIndex(arr.length,curr)];
},
supportTransition : (function(){
// 这里只是简单的判断一个是否是webkit内核
return window.navigator.userAgent.toLowerCase().indexOf("webkit")>=0;
})(),
/*
* 动画工具，元素elem从当前状态运行到to样式状态，花费time和时间
* 注：需要使用setTimeout 0 是为了以上javascript执行器一直占用UI线程，导致元素的CSS动画得不到所需要的效果。其中一个例子就是：当设置Duration为0时，如果后面的代码再有设置Duration不为0的，则执行时CSS的Duration为0不生效。这是由于js执行时长时间占用UI线程，导致页面渲染前WebkitTransitionDuration已经不为0了。
*/
transition : function(elem,to,time){
setTimeout(function(){
sina.css(elem,{
display : "",
WebkitTransform : "translate3d(0,0,0)",
//WebkitTransitionTimingFunction : "linear",
WebkitTransitionDuration : time
});
sina.css(elem,to);
sina.css(elem.imgObj,{
WebkitTransform : "translate3d(0,0,0)",
//WebkitTransitionTimingFunction : "linear",
WebkitTransitionDuration : time
});
sina.css(elem.imgObj,to.imgObj);
},0);
}
};
var d = document,w = this, b = d.body, h = d.documentElement;
var scrollPic3D = function(){};
scrollPic3D.prototype = {
boxId : '', //容器id
width : 500, //容器宽度
height : 100, //容器高度
imgWidth : 90, //图片宽度
imgHeight : 120, //图片高度
descHeight : 100,
descClass : "picdesc",
showsNumber : 7, //显示数量
zoom : 0.8, //小图缩放比
data : [],
position : [],
timeLimit : 200, //动画时间，100毫秒
leftIndex : 0,//最左边图片的数据下标
autoPlay : false, //是否自动播放
autoPlayTime : 5, //自动播放时间间隔
version : "1.0",
author : "mengjia",
init : function(){
this.initData();
if(this.data.length < this.showsNumber){alert('错误：滚动图片数据小于显示数据');return};
if(this.showsNumber % 2 == 0){this.showsNumber++}; //保证是奇数
var boxEl = sina.$(this.boxId);
boxEl.style.width = this.width + 'px';
boxEl.style.height = this.height + 'px';
boxEl.style.position = 'relative';
boxEl.style.overflow = 'hidden';
boxEl.style.zoom = 1;
this.setLeftIndex(0);
this.showDesc(this.index);// 显示初始化模块的信息
this.ifDestory();
},
/*
* 销毁页面时的数据删除处理，防止内存泄露
*/
ifDestory : function(){
var thisObj = this;
sina.addEvent(w,"unload",function(){
delete thisObj.data;
});
},
/*
* 初始化数据，把目标窗口this.boxId中的所有image元素做为需要动态显示的图片元素，每一个元素的下一个节点是其描述信息，会添加到新创建的节点中做显示处理。如果这个图片没有描述信息，则添加空节点
*
*/
initData : function(){
// 处理所有img元素
var boxEl = sina.$(this.boxId);
// 添加相应的操作元素和显示描述的元素
var descEl = d.createElement("div");
descEl.id = this.descId = "descEL-"+ (+new Date());
descEl.className = "imgDesc_";
descEl.style.position = "absolute";
descEl.style.height = this.descHeight + "px";
descEl.style.bottom = 0;
descEl.style.width = "100%";
boxEl.appendChild(descEl);
var objs = boxEl.childNodes,obj,imgObj;
var imgObjs = boxEl.getElementsByTagName("img"),imgObj,tempThis = this;
for (var i = 0,j=0,len = objs.length; i < len; i++){
obj = objs[i];
if(obj.tagName != "DIV")continue;
//obj.num = i;
obj.style.position = 'absolute';
imgObj = obj.getElementsByTagName("img")[0];
// 如果没有图片，则跳过
if(!imgObj)continue;
obj.imgObj = imgObj;
imgObj.num = obj.num = j++;
imgObj.style.width = "100%";
imgObj.style.height = "100%";
// sina.addEvent(imgObj,"click",function(e){
// e = e || w.event;
// var tar = e.target || e.srcElement;
// // 如果当前页面正是焦点图，则可弹出页面
// tempThis.go(tar.num);
// if(tempThis.index != tar.num){
// if ( e.preventDefault ) {
// e.preventDefault();
// }
// if ( e.stopPropagation ) {
// e.stopPropagation();
// }
// return false;
// }
// });
// 把对图片相应的描述内容放置到descEl元素中
var next = this._getDescEl(obj);
if(!next){
next = d.createElement("div");
}
next.style.display = "none";
descEl.appendChild(next);
this.data.push(obj);
}
},
/*
* 显示前一个图片，有动画
*
*/
pre : function(){
this.go(this.index - 1);
},
/*
* 显示下一个图片，有动画
*
*/
next : function(){
this.go(this.index + 1);
},
/*
* 自动播放函数，通过this.autoPlay属性控制
*
*/
autoPlayFunc : function(){
if(this.autoPlay){
clearInterval(this._autoPlay);
var tempThis = this;
this._autoPlay = setInterval(function(){tempThis.next();},this.autoPlayTime*1000);
};
},
/*
* css3的移动到下一个的动画实现函数
* @param clockwise {Boolean} 是顺时针还是逆时针运动
* @param time {Number} 执行这次动画所需要的时间
*
*/
transNext : function(clockwise,time){
var datas = this.data,leftIndex = this.leftIndex,posArr = this.position,len = this.showsNumber,pos,elem,
//获取需要提前准备的元素
el = sina.getArrEl(datas,clockwise?leftIndex+len : leftIndex-1),
// 获取该元素所对应的样式
s = sina.getArrEl(posArr,clockwise?posArr.length-1:0);
// 立即应用该样式
sina.transition(el,s,"0s");
for (var i = 0; i <= len; i++){
// 获取当前对应的元素
elem = sina.getArrEl(datas,clockwise?i+leftIndex:i-1+leftIndex);
//给对应的元素设置对应的位置信息，同时指定css动画的时间
pos = sina.getArrEl(posArr,clockwise?i:i+1);
sina.transition(elem,pos,time+"ms");
}
// 设置leftIndex和index值
this.leftIndex = sina.getCurrIndex(datas.length,clockwise?leftIndex+1:leftIndex-1);
this.index = sina.getCurrIndex(datas.length,this.leftIndex + Math.floor(len / 2));
},
/*
* 把中间的图片设置成第下标为index的图片，有动画
* @param index {Integer} 目标图片对应的下标值
* @example
* 例如：需要显示第2副图的描述信息，则===> go(1)，则会产生动画效果
*
*/
go : function(index){
if(this.index == index){return;};
var start = this.index, end = index, len = this.data.length;
clearTimeout(this._timeout);
//最短路程
if(Math.abs(end - start) > len / 2){
if(end > len / 2){
end = end - len;
}else{
end = end + len;
};
};
// 根据是否支持css3动画 分别做处理
this[sina.supportTransition?"_css3Animate":"_jsAnimate"](end);
},
/*
* css3 Transition动画实现函数，传入结束值,开始产生动画
*
*/
_css3Animate : function(end){
var obj = this,start = this.index, length = Math.abs(end - start),
stepTime = this.timeLimit / length;
this._timeout = setTimeout(function(){
if(!length--){//根据路程做多个timeout调用
if(obj.onend){obj.onend(start,obj.index)};
return;
}
obj.transNext(end > start,stepTime);
obj._timeout = setTimeout(arguments.callee,stepTime/2);
},0);
},
/*
* js动画实现函数，传入结束值,开始产生动画
*
*/
_jsAnimate : function(end){
//步数
var step = this.timeLimit / 20, obj = this, start = this.index, now = 0;
this._timeout = setTimeout(function(){
var index = obj.index;
if(now >= step){
if(index != Math.round(index))
obj.go(Math.round(index));
if(obj.onend){obj.onend(start,index)};
return;
};
now ++;
var t = now;
// 设置动画运行特效，三次方函数
var value = ((end - start)*((t=t/step-1)*t*t + 1))+ start;
obj.setIndex(value);
obj._timeout = setTimeout(arguments.callee,20);
},20);
},
/*
* 获取当前图片对应的描述元素
* @param {HTMLDomElement} 图片元素对应的HTMLDomElement
*
*/
_getDescEl : function(obj){
var nodes = obj.childNodes,node;
for (var i = 0,len = nodes.length; i < len; i++){
node = nodes[i];
if(node && node.className && node.className.indexOf(this.descClass) >= 0)
return node;
}
return null;
/*var pNode = imgEl.parentNode,
next = sina.next(pNode.tagName.toLowerCase() == "a"?pNode :imgEl),
tagName = next?next.tagName.toLowerCase():"";
// 需要显示新图片的描述信息
if(!next || (next && (tagName == "img" || tagName == "a" || next.id == this.descId))){
// 没有描述元素，返回空
return null;
}
return next;
*/
},
/*
* 只显示当前下标图片对应的描述信息
* @param {Integer} 当前图片对应的下标值
* @example
* 例如：需要显示第2副图的描述信息，则===> showDesc(1)
*
*/
showDesc : function(currIndex){
var children = sina.$(this.descId).childNodes;
for (var i = 0,len = children.length; i < len; i++){
children[i].style.display = i == currIndex?"":"none";
}
},
/*
* 图片轮转完成后触发的动作
* @param preIndex {Integer} 原来图片的下标
* @param currIndex {Integer} 当前图片的下标
* TODO 可以做一些动画效果，例如描述信息的淡入淡出等
*
*/
onend : function(preIndex , currIndex){
// TODO 可以做动画过渡效果
currIndex = Math.round(currIndex);
if(currIndex >= this.data.length){
currIndex = currIndex - this.data.length;
}
this.showDesc(currIndex);
},
/*
* 设置当前下标的值作为中间图片，无动画
* @param index {Integer} 图片的下标
*
*/
setIndex : function(index){
this.setLeftIndex(index - Math.floor(this.showsNumber/2));
},
/*
* 设置当前下标的值作为最左边图片，无动画
* @param leftIndex {Integer} 图片的下标
*
*/
setLeftIndex : function(leftIndex){
var picLen = this.data.length,half = this.showsNumber/2,getIndex = sina.getCurrIndex;
//避免浮点运算的bug
leftIndex = Math.round(leftIndex * 1000) / 1000;
leftIndex = getIndex(picLen,leftIndex);
this.leftIndex = leftIndex;
var index = getIndex(picLen,Math.floor(half) + leftIndex);
this.index = index;
for(var i=0;i<picLen;i++){
if(this.data[i]){
this.data[i].style.display = 'none';
};
};
var tempThis = this,obj,w,h,t,l,z;
for(var i=0,len = (this.showsNumber == this.data.length)?this.showsNumber-1:this.showsNumber;i<=len;i++){
var pos = getIndex(picLen,leftIndex + i);
pos = Math.floor(pos);//用于数据下标
var pos_f = i - leftIndex + Math.floor(leftIndex); //浮点位置，允许为小数
var size = (half - Math.abs(pos_f - half + 0.5));
var zIndex = Math.ceil(size);
obj = this.data[pos];
obj.style.display = '';
obj.style.zoom = 1;
var zoom = Math.abs(this.zoom + (1 - this.zoom) / half * size);
// 设置图片的宽高
w = Math.round(this.imgWidth * zoom);
h = Math.round(this.imgHeight * zoom);
var imgObj = obj.imgObj;
imgObj.style.width = w + 'px';
imgObj.style.height = h + 'px';
imgObj.style.zoom = 1;
// 设置图片的宽度
var imgW = imgObj.offsetWidth, imgH = imgObj.offsetHeight, imgBorder = imgW - w;
obj.style.width = imgW + "px";
obj.style.height = imgH + "px";
var objW = obj.offsetWidth,objH = obj.offsetHeight,objBorder = objW - imgW;
// 设置图片的位置信息，只记录left值
l = (this.width / 2 - (this.imgWidth + objBorder) / 2) / (half - 0.5) * (size - 0.5) ;
l = half > i? l : this.width - l - objW;
obj.style.left = l + "px";
t = Math.round((this.height - objH - this.descHeight) / 2 );
obj.style.top = t + 'px';
obj.style.zIndex = z = Math.round(zIndex);
//setTimeout(function(){
obj.style.zoom = 1;
imgObj.style.zoom = 1;
//},0);
// 这里保存初始时所有确定的图片位置大小等信息
if(sina.supportTransition && !this.position[i]){
this.position[i] = {
zIndex:z*100,// 放大zindex
left:l + "px",
top:t+"px",
width:imgW +"px",
height:imgH+"px",
imgObj : {
width : w + "px",
height : h + "px"
}
}
};
}
// 保存显示元素前一个和最后一个的位置
if(sina.supportTransition && this.position.length != this.showsNumber+2){
var temp = this.position[0];
this.position.unshift(sina.extend(sina.extend({},temp),{
left : "-"+temp.width,
zIndex : 0
}));
this.position[this.position.length-1] = sina.extend(sina.extend({},temp),{
left : this.width+"px",
zIndex : 0
});
};
this.autoPlayFunc();
}
};
w.scrollPic3D = scrollPic3D;
})();
</script>
</head>
<body>
<div style="width:600px; border:red solid 1px; margin:0px 50px ;">
<div class="p_cont">
<div id="scrollBox">
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<div class="bg"></div>
<div class="title">
型男腕上最佳时尚腕表
</div>
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</div>
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</div>
</div>
<a href="#;" onclick="scrollPic.pre()" class="arrleft" onfocus="this.blur()">上一个</a> <a href="#;" onclick="scrollPic.next()" class="arrright" onfocus="this.blur()">下一个</a>
<script type="text/javascript">
var scrollPic = new scrollPic3D();
scrollPic.boxId = 'scrollBox'; //容器id
scrollPic.width = 600; //容器宽度
scrollPic.height = 260; //容器高度
scrollPic.imgWidth = 220; //图片宽度
scrollPic.imgHeight = 250; //图片高度
scrollPic.descHeight = 0; //描述宽度
scrollPic.showsNumber = 5; //显示数量
scrollPic.autoPlay = false; //是否自动播放
scrollPic.autoPlayTime = 5;
scrollPic.zoom = 0.5; //小图缩放比
scrollPic.timeLimit = 500;
scrollPic.init();
</script>
</div>
</body>
</html>