求js特效：图片可以左右切换，且点击某张图片会弹出大图，同时大图也可以左右切换
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<link href="css/style.css" rel="stylesheet" />
<script src="js/js.js" type="text/javascript"></script>
</head>
<body>
<div class="lp_wrap">
<div class="lp_left"></div>
<div class="lp_main">
<ul>
<li><img src="images/1.jpg" alt="我是1" /></li>
<li><img src="images/2.jpg" alt="我是2" /></li>
<li><img src="images/3.jpg" alt="我是2" /></li>
<li><img src="images/4.jpg" alt="我是2" /></li>
<li><img src="images/5.jpg" alt="我是2" /></li>
<li><img src="images/6.jpg" alt="我是2" /></li>
<li><img src="images/7.jpg" alt="我是2" /></li>
<li><img src="images/8.jpg" alt="我是2" /></li>
</ul>
</div>
<div class="lp_right"></div>
</div>
<!--隐藏域-->
<div class="lp_alert">
<div class="lp_aleft"></div>
<div class="lp_aimg" style="width:540px; height:400px;">
<img src="images/1.jpg" />
<span></span>
<font></font>
</div>
<div class="lp_aright"></div>
<div class="clear"></div>
</div>
<div class="zhezhao"></div>
<!--隐藏域-->
</body>
</html>
window.onload = function (){
function getClass(className){
var get = document.getElementsByTagName('*');
var arr = [];
for(var i = 0; i < get.length; i ++){
if(get[i].className == className){
arr.push(get[i]);
}
}
return arr;
}
function lp(lp1,lp2,lp3,lp4,lp5,lp6,lp7){
var wrap = getClass(lp1)[0];
var ul = getClass(lp2)[0].getElementsByTagName('ul')[0];
var li = ul.getElementsByTagName('li');
var mar_r = 10; //margin-right
var w = li[0].offsetWidth + mar_r;
var l = li.length;
var max = w * l;
var setIndex = 0;
var lp_aleft = getClass(lp3)[0];
var lp_img = getClass(lp4)[0];
var img = lp_img.getElementsByTagName('img')[0];
var font = lp_img.getElementsByTagName('font')[0];
var lp_aright = getClass(lp5)[0];
var lp_zhezhao = getClass(lp6)[0];
var lp_wrap = getClass(lp7)[0];
var lp_iw = 540; //为弹出 元素宽 ps：隐藏元素获取不到宽 高，估 写死值
var lp_ih = 400; //为弹出 元素高
//获取屏幕宽高
var wid = document.body.clientWidth | document.documentElement.clientWidth;
var hei = document.body.clientHeight | document.documentElement.clientHeight;
//求值居中
function left(n,w){
return (n - w) / 2;
}
function top(n,h){
return (n - h) / 2;
}
lp_img.style.left = left(wid,lp_iw) + 'px';
lp_img.style.top = top(hei,lp_ih) + 'px';
lp_aleft.style.top = top(hei,lp_aleft.offsetHeight) + 'px';
lp_aright.style.top = top(hei,lp_aleft.offsetHeight) + 'px';
lp_zhezhao.style.width = wid + 'px';
lp_zhezhao.style.height = hei + 'px';
//窗口改变大小
window.onresize = function (){
console.log(lp_img.offsetWidth);
wid = document.body.clientWidth | document.documentElement.clientWidth;
hei = document.body.clientHeight | document.documentElement.clientHeight;
lp_img.style.left = left(wid,lp_img.offsetWidth) + 'px';
lp_img.style.top = top(hei,lp_img.offsetHeight) + 'px';
lp_aleft.style.top = top(hei,lp_aleft.offsetHeight) + 'px';
lp_aright.style.top = top(hei,lp_aleft.offsetHeight) + 'px';
lp_zhezhao.style.width = wid + 'px';
lp_zhezhao.style.height = hei + 'px';
}
for(var i = 0; i < l; i ++){
ul.appendChild(li[i].cloneNode(true));
}
for(var i = 0; i < li.length; i ++){
li[i].index = i;
li[i].onclick = function (){
_this = this;
img.src = this.getElementsByTagName('img')[0].src
font.innerHTML = this.getElementsByTagName('img')[0].alt;
lp_wrap.style.display = 'block';
lp_zhezhao.style.display = 'block';
lp_aleft.onclick = function (){
_this.index --;
if(_this.index < 1){
_this.index = 0;
alert('当前第一张');
}
console.log(_this.index);
img.src = li[_this.index].getElementsByTagName('img')[0].src
font.innerHTML = li[_this.index].getElementsByTagName('img')[0].alt;
}
lp_aright.onclick = function (){
_this.index ++;
if(_this.index >= li.length){
_this.index = li.length - 1;
alert('最后一张');
}
img.src = li[_this.index].getElementsByTagName('img')[0].src
font.innerHTML = li[_this.index].getElementsByTagName('img')[0].alt;
}
}
}
var stop = setInterval(setl,30);
function setl(){
if(setIndex >= max){
setIndex = 0;
}
setIndex ++;
ul.style.left = -setIndex + 'px';
}
wrap.onmouseover = function (){
clearInterval(stop);
}
wrap.onmouseout = function (){
stop = setInterval(setl,30);
}
}
new lp('lp_wrap','lp_main','lp_aleft','lp_aimg','lp_aright','zhezhao','lp_alert');
}
*{ margin:0; padding:0; list-style:none; }
.clear{ clear:both; }
.lp_wrap{ width:900px; margin:0 auto; }
.lp_main{ width:835px; margin-left:17px; height:188px; overflow:hidden; float:left; position:relative; }
.lp_main ul{ width:1000em; position:absolute; }
.lp_main ul li{ float:left; margin-right:10px; }
.lp_main ul li img{ width:253px; height:188px; }
.lp_left{ background:url(../images/left_arrow.jpg) 0 50% no-repeat; width:15px; height:188px; float:left; }
.lp_right{ background:url(../images/right_arrow.jpg) 0 50% no-repeat; width:15px; height:188px; float:right; }
.zhezhao{ display:none; background:#000; opacity:0.3; position:fixed; top:0; left:0; z-index:233;}
.lp_aleft{ background:url(../images/aleft.png) no-repeat; width:35px; cursor:pointer; height:63px; margin-left:165px; }
.lp_alert{height:0; width:1000px; margin:0 auto; display:none;}
.lp_aimg,.lp_aleft,.lp_aright{ position:absolute; z-index:234;}
.lp_aright{ background:url(../images/aright.png) no-repeat; width:35px; cursor:pointer; height:63px; margin-left:800px; }
.lp_aimg span{ width:540px; height:30px; background:#000; display:block; opacity:0.5; position:absolute; margin-top:-33px; }
.lp_aimg font{ width:540px; height:30px; margin-top:-33px; display:block; color:#fff; font-size:14px; position:absolute; line-height:30px; text-align:center; }
以前练习的时候做的，你看看，合胃口?
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