本文目录一览：
js实现左右切换轮播图思路
我们在 CSS 阶段就已经接触到轮播图。通过轮播图我们可以达到一些好玩的特效，但使用 CSS 做出来的轮播图只有左右切换，渐变切换和简单的点粗宏击切换。局限性较大，观看效果也不佳。但当我们接触 js 之后，你就发现使用js来实现轮播图后，在看CSS实现轮播的效果就是...。我想说啥你知道的。废话不多说，咱们一起看看如何使用js来实现轮播效果。
（本文以阴阳师中“平安世界”模块的轮播图为例）
这个轮播图，我们通过两大模块构成；左右点击模块和姓名点击模块。然后在两者相关联来达到最终的效果。
在使用js实现轮播图的效果前，先使用HTML和CSS完善这一模块的布局。
本轮播图使用8张图片。每次出现两张。我们在使用HTML和CSS布局时可以先把第一组的两张图片放好位置。其他的放在两边隐藏起来。需要使用的时候在出现移动到中间。
左右点击切换模块：
我们通过对左右按钮进行点击监滑凳尺听。在点击后做出反应。左右点击的思路一样。我们先说一下右边按钮点击事件。
当我们点击右边按钮后，我们通过对点击次数进行累计。此处我使用初始化常量然后累加最后通过判断来达到循环效果
对每一张图片进行编码，以此来达到循环切换图片的效果。在切换图片时，我们可以使用排他思想。当点击按钮切换下一张图片的时候，我们可以先遍历所有的图片，把所有的图片移动到两边，然后将要移动的图片移动到中央来达到切换效果-js图片切换特效
在移动的过程中的动画和定时器设置的延迟可以自己添加一下。
左边按钮的原理和信高右边一样反操作即可。注意常量要使用一个。否则两个按钮都只能单方向运动，可能还会出现其他问题。
本次现讲一下左右切换的思路。
寻网页中JS实现的图片切换特效
我修改测试通过一个。但是有个问题。若改成鼠标悬停边缘滚下去，也就是onMouseOver。是停不下来的，会一直滚下去，因为无论怎么样都是鼠标碰触事件。所以我强烈建议用点击事件,onclick。
js css image都是调用的。我都写到页面里了，你自己改下。图片地址我没改。本地测试的。自己换成你的图片。
!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" ""顷散
html
head
meta http-equiv="Content-Type" content="text/html; charset=utf-8"
title图片展示特效/title
style
body{ margin:20px auto; width:100%; height:auto;}
#dHomePageCarousel {
height:221px;
width:670px;
position:relative;
margin:40px auto;
}
#dLocalHomesCarousel {
height:131px;
margin:0px 2px 3px 1px;
overflow:hidden;
position:relative;
}
.divCarouselInfo {
color:#3C404E;
font-size:12px;
width:639px;
height:64px;
line-height:16px;
margin-right:15px;
padding-top:10px;
position:relative;
}
.imgBorder{
border:2px solid #fff;
position:absolute;
cursor:pointer;
}
.imgBorder:hover {
border:2px solid #FFAA55;
cursor:pointer;
position:absolute;
}
.btnCarouselLT {
background:url("../images/btn_nav_carousel.png") no-repeat scroll left top transparent;
display:block;
height:41px;
overflow:hidden;
position:absolute;
cursor:pointer;
top:17px;
width:40px;
}
.btnCarouselRT {
background:url("../images/btn_nav_carousel.png") no-repeat scroll right top transparent;
display:block;
height:41px;
overflow:hidden;
position:absolute;
cursor:pointer;
top:17px;
width:40px;
}
img {
border:medium none;
}
.author{ width:700px; margin:0 auto; height:auto; text-align:center;}
/style
/head
body onLoad="clearInterval(autoplay);"
!-- 头开始 --
!-- 滚动房源广告开始 --
div id="dHomePageCarousel" style="padding-left:15px"
div id=dLocalHomesCarousel
img id="imgSmallLeft" class="imgBorder" style="height:50px; width:70px; left:10px; bottom:5px;" onClick="clearInterval(autoplay);moveD('l');"/-js图片切换特效
升乎空吵瞎img id="imgMiddleLeft" class="imgBorder" style="height:75px; width:100px; left:110px; bottom:5px;" onClick="clearInterval(autoplay);move('l');"/-js图片切换特效
img id="imgBig" class="imgBorder" style="height:105px; width:140px; left:240px; bottom:5px;" onClick="openNewPage();"/-js图片切换特效
img id="imgMiddleRight" class="imgBorder" style="height:75px; width:100px; left:410px; bottom:5px;" onClick="clearInterval(autoplay);move('r');"/-js图片切换特效
img id="imgSmallRight" class="imgBorder" style="width:70px; height:50px; left:540px; bottom:5px;" onClick="clearInterval(autoplay);moveD('r');"/-js图片切换特效
img id="imgHidden" class="imgBorder" style="width:10px; height:10px; left:-90px; bottom:5px;"/
/div
script type="text/javascript"
function AdItem(Photo,url) {
this.Photo = Photo;
this.url = url;
}
var ad = new Array();
ad[0] = new AdItem('images/1.jpg','#'); ad[1] = new AdItem('images/2.jpg','#'); ad[2] = new AdItem('images/3.jpg','#'); ad[3] = new AdItem('images/4.jpg','#'); ad[4] = new AdItem('images/5.jpg','#'); ad[5] = new AdItem('images/6.jpg','#'); ;-js图片切换特效
var img = new Array();
img[0] = document.getElementById("imgSmallLeft");
img[1] = document.getElementById("imgMiddleLeft");
img[2] = document.getElementById("imgBig");
img[3] = document.getElementById("imgMiddleRight");
img[4] = document.getElementById("imgSmallRight");
img[5] = document.getElementById("imgHidden");
var position = 0;
for(i=0;iimg.length;i++){
img[i].src = ad[i].Photo;
}
var cur = 2;
adname.href = ad[2].url;
/script
/div
script type="text/javascript"
function roll(direction){
var imgLength = img.length;
var dataLength = ad.length;
var start = position;
if('r' == direction){
for(var i=0; iimgLength; i++){
start = start + 1;
if(start (dataLength-1))
start = start - dataLength;
img[i].src = ad.Photo;
}
position = position + 1;
if(position (dataLength-1))
position = position - dataLength;
}
if('l' == direction){
var a = true;
for(var i=0; iimgLength; i++){
if(a){
start = start - 1;
if(start 0){
start = start + dataLength;
a = false;
}
if(start (dataLength-1)){
a = false;
}
}else{
start = start + 1;
if(start (dataLength-1)){
start = start - dataLength;
a = true;
}
}
//alert(position + " === " + i + " === " + start);
img[i].src = ad.Photo;
if(start == (dataLength-1)){
start = -1;
}
}
position = position - 1;
if(position 0)
position = position + dataLength;
}
}
function right(){
i++;
var img0H = parseFloat(img[0].style.height);
var img0W = parseFloat(img[0].style.width);
var img0L = parseFloat(img[0].style.left);
var img1H = parseFloat(img[1].style.height);
var img1W = parseFloat(img[1].style.width);
var img1L = parseFloat(img[1].style.left);
var img2H = parseFloat(img[2].style.height);
var img2W = parseFloat(img[2].style.width);
var img2L = parseFloat(img[2].style.left);
var img3H = parseFloat(img[3].style.height);
var img3W = parseFloat(img[3].style.width);
var img3L = parseFloat(img[3].style.left);
var img4H = parseFloat(img[4].style.height);
var img4W = parseFloat(img[4].style.width);
var img4L = parseFloat(img[4].style.left);
var img5H = parseFloat(img[5].style.height);
var img5W = parseFloat(img[5].style.width);
var img5L = parseFloat(img[5].style.left);
//解决IE兼容性问题
if(navigator.userAgent.indexOf("MSIE")0 i%2==0) {
img1W = img1W + 1;
img2H = img2H + 1;
img2L = img2L + 1;
img3H = img3H + 1;
img3L = img3L + 1;
img4L = img4L + 1;
img4W = img4W + 1;
}
img[0].style.height = (img0H - 2).toString() + "px";
img[0].style.left = (img0L - 5).toString() + "px";
img[0].style.width = (img0W - 3).toString() + "px";
img[1].style.height = (img1H - 1).toString() + "px";
img[1].style.left = (img1L - 5).toString() + "px";
img[1].style.width = (img1W - 1.5).toString() + "px";
img[2].style.height = (img2H - 1.5).toString() + "px";
img[2].style.left = (img2L - 6.5).toString() + "px";
img[2].style.width = (img2W - 2).toString() + "px";
img[3].style.height = (img3H + 1.5).toString() + "px";
img[3].style.left = (img3L - 8.5).toString() + "px";
img[3].style.width = (img3W + 2).toString() + "px";
img[4].style.height = (img4H + 1).toString() + "px";
img[4].style.left = (img4L - 6.5).toString() + "px";
img[4].style.width = (img4W + 1.5).toString() + "px";
img[5].style.height = (img5H + 2).toString() + "px";
img[5].style.left = (img5L - 5).toString() + "px";
img[5].style.width = (img5W + 3).toString() + "px";
//alert(img[1].style.width);
if(i19){
clearInterval(hide);
reset();
roll('r');
isRunning = 'false';
}
}
function left(){
i++;
var img0H = parseFloat(img[0].style.height);
var img0W = parseFloat(img[0].style.width);
var img0L = parseFloat(img[0].style.left);
var img1H = parseFloat(img[1].style.height);
var img1W = parseFloat(img[1].style.width);
var img1L = parseFloat(img[1].style.left);
var img2H = parseFloat(img[2].style.height);
var img2W = parseFloat(img[2].style.width);
var img2L = parseFloat(img[2].style.left);
var img3H = parseFloat(img[3].style.height);
var img3W = parseFloat(img[3].style.width);
var img3L = parseFloat(img[3].style.left);
var img4H = parseFloat(img[4].style.height);
var img4W = parseFloat(img[4].style.width);
var img4L = parseFloat(img[4].style.left);
var img5H = parseFloat(img[5].style.height);
var img5W = parseFloat(img[5].style.width);
var img5L = parseFloat(img[5].style.left);
//解决IE兼容性问题
if(navigator.userAgent.indexOf("MSIE")0 i%2==0) {
img0W = img0W + 1;
img1H = img1H + 1;
img1L = img1L + 1;
img2H = img2H + 1;
img2L = img2L + 1;
img3L = img3L + 1;
img3W = img3W + 1;
}
img[0].style.height = (img0H + 1).toString() + "px";
img[0].style.left = (img0L + 5).toString() + "px";
img[0].style.width = (img0W + 1.5).toString() + "px";
img[1].style.height = (img1H + 1.5).toString() + "px";
img[1].style.left = (img1L + 6.5).toString() + "px";
img[1].style.width = (img1W + 2).toString() + "px";
img[2].style.height = (img2H - 1.5).toString() + "px";
img[2].style.left = (img2L + 8.5).toString() + "px";
img[2].style.width = (img2W - 2).toString() + "px";
img[3].style.height = (img3H - 1).toString() + "px";
img[3].style.left = (img3L + 6.5).toString() + "px";
img[3].style.width = (img3W - 1.5).toString() + "px";
img[4].style.height = (img4H - 2).toString() + "px";
img[4].style.left = (img4L + 5).toString() + "px";
img[4].style.width = (img4W - 3).toString() + "px";
img[5].style.height = (img5H + 2).toString() + "px";
img[5].style.left = (img5L + 5).toString() + "px";
img[5].style.width = (img5W + 3).toString() + "px";
//alert(img[1].style.left);
if(i19){
clearInterval(hide);
reset();
roll('l');
isRunning = 'false';
}
}
var isRunning;
function move(direction){
//alert(isRunning);
if(isRunning != 'udefined' isRunning == 'true')
return;
frequency = 20;
if(navigator.userAgent.indexOf("MSIE")0) {
frequency = 15;
}
if(isFirefox=navigator.userAgent.indexOf("Firefox")0){
frequency = 20;
}
i = 0;
if(direction == 'r'){
cur = cur + 1;
img[5].style.left = "640px";
hide = setInterval("right()", frequency);
isRunning = 'true';
}
if(direction == 'l'){
cur = cur - 1;
img[5].style.left = "-90px";
var pos = position - 1;
if(pos 0)
pos = pos + ad.length;
img[5].src = ad[pos].Photo;
hide = setInterval("left()", frequency);
isRunning = 'true';
}
if(cur (ad.length - 1))
cur = 0;
if(cur 0)
cur = ad.length - 1;
//alert(cur);
adname.href = ad[cur].url;
if(navigator.userAgent.indexOf("Firefox")0){
adname.textContent = ad[cur].name;
adtel.textContent = ad[cur].phone;
adaddr.textContent = ad[cur].address;
adprice.textContent = ad[cur].price;
adtime.textContent = ad[cur].time;
} else {
adname.innerText = ad[cur].name;
adtel.innerText = ad[cur].phone;
adaddr.innerText = ad[cur].address;
adprice.innerText = ad[cur].price;
adtime.innerText = ad[cur].time;
}
}
function moveC(direction){
if(isRunning != 'true'){
move(direction);
clearInterval(movec);
}
}
function moveD(direction){
move(direction);
if('r' == direction){
movec = setInterval("moveC('r')",5);
} else {
movec = setInterval("moveC('l')",5);
}
}
function reset(){
img[0].style.width = "70px";
img[0].style.height = "50px";
img[0].style.left = "10px";
img[1].style.width = "100px";
img[1].style.height = "75px";
img[1].style.left = "110px";
img[2].style.width = "140px";
img[2].style.height = "105px";
img[2].style.left = "240px";
img[3].style.width = "100px";
img[3].style.height = "75px";
img[3].style.left = "410px";
img[4].style.width = "70px";
img[4].style.height = "50px";
img[4].style.left = "540px";
img[5].style.width = "10px";
img[5].style.height = "10px";
img[5].style.left = "-90px";
}
autoplay = setInterval("move('r')",2000);
function openNewPage(){
window.open(ad[cur].url);
}
/script
!-- 滚动房源广告结束 --
/body
/html
JS切换图片(使用了定时器setInterval()方法)
setInterval()方脊尘仔法兄备：每隔一樱汪段事件执行一次函数
--参数：1、回调函数
2、间隔时间，毫秒为单位
例子：每隔1秒打印一次hello
图片切换效果图：
怎么用JS特效去做一个网页背景图片切换？（带略缩图）
style
#bg img{margin:0 5px;border:1px solid #ddd;width:80px;height:80px;}
#bg img.on{border-color:#f00;}
/style
div id="bg"
img src="缩略图地址" rel="大图地址"
img src="缩略图地址" rel="大图地址"
乱中img src="缩略图地址" rel="大图地址"
/div
//引入jQuery.js
script
var $mg=$("#bg").find("img");
$mg.click(function(){
var big=$(this).attr("rel");
$("body").css("background","url("+big+") 50% 50% no-repeat");
$(this).addClass("on").siblings("img").removeClass("on");
});
/script
上面就是最颂陪拆简野枣单的背景切换加缩略图，需要引入jQuery哈
