1、<html>
<head>
<meta http-equiv="Content-Type" content="text/htmlcharset=gb2312" />
<title>Jquery deal images</title>
<script src="./js/jquery.js" type="text/javascript"></script>
<script type="text/javascript">
<!--
//这里是JS代码 ，下面豆芽会写上
//-->
</script>
</head>
<body>
<img src="./images/img02.png" />
</body>
</html>
2、
$(document).ready(function(){
var newImage = new Image()//预载入图片
var oldImage = $('img').attr('src')
newImage.src = './images/img03.jpg'
$('img').hover(function(){ //鼠标滑过图片切换
$('img').attr('src',newImage.src)
},
function(){
$('img').attr('src',oldImage)
})
})
这里大家迷惑的是为什么要预载入图片呢？因为在网站上不像我们本地调试，图片下载这么快。如果是在互联网上，当鼠标滑过将要切换的图片时，替换的图片还要临时下载，加载图片的过程是比较慢的。所以我们预载入图片可以解决这个问题。
<!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/htmlcharset=gb2312">
<title>网页特效 首页图片切换</title>
<style type="text/css">
/* Reset style */
* { margin:0padding:0word-break:break-all}
body {
background:#fff
color:#000000
font:12px/1.6em Helvetica, Arial, sans-serif
margin-left: 0px
margin-top: 0px
margin-right: 0px
margin-bottom: 0px
}
h1, h2, h3, h4, h5, h6 { font-size:1em}
a { color:#0287CAtext-decoration:none}
a:hover { text-decoration:underline}
ul, li { list-style:none}
fieldset, img { border:none}
legend { display:none}
em, strong, cite, th { font-style:normalfont-weight:normal}
input, textarea, select, button { font:12px Helvetica, Arial, sans-serif}
table { border-collapse:collapse}
html { overflow:-moz-scrollbars-vertical} /*Always show Firefox scrollbar*/
/* iFocus style */
#ifocus { width:650pxheight:245pxmargin:0pxborder:1px solid #DEDEDEbackground:#F8F8F8}
#ifocus_pic { display:inlineposition:relativefloat:leftwidth:540pxheight:225pxoverflow:hiddenmargin:10px 0 0 10px}
#ifocus_piclist { position:absolute}
#ifocus_piclist li { width:550pxheight:225pxoverflow:hidden}
#ifocus_piclist img { width:550pxheight:225px}
#ifocus_btn { display:inlinefloat:rightwidth:91pxmargin:9px 9px 0 0}
#ifocus_btn li { width:91pxheight:57pxcursor:pointeropacity:0.5-moz-opacity:0.5filter:alpha(opacity=50)}
#ifocus_btn img { width:75pxheight:45pxmargin:7px 0 0 11px}
#ifocus_btn .current { background: url(img/ifocus_btn_bg.gif) no-repeatopacity:1-moz-opacity:1filter:alpha(opacity=100)}
#ifocus_opdiv { position:absoluteleft:0bottom:0width:545pxheight:35pxbackground:#000opacity:0.5-moz-opacity:0.5filter:alpha(opacity=50)}
#ifocus_tx { position:absoluteleft:8pxbottom:8pxcolor:#FFF}
#ifocus_tx .normal { display:none}
</style>
<script type="text/javascript">
function $(id) { return document.getElementById(id)}
function addLoadEvent(func){
var oldonload = window.onload
if (typeof window.onload != 'function') {
window.onload = func
} else {
window.onload = function(){
oldonload()
func()
}
}
}
function moveElement(elementID,final_x,final_y,interval) {
if (!document.getElementById) return false
if (!document.getElementById(elementID)) return false
var elem = document.getElementById(elementID)
if (elem.movement) {
clearTimeout(elem.movement)
}
if (!elem.style.left) {
elem.style.left = "0px"
}
if (!elem.style.top) {
elem.style.top = "0px"
}
var xpos = parseInt(elem.style.left)
var ypos = parseInt(elem.style.top)
if (xpos == final_x &&ypos == final_y) {
return true
}
if (xpos <final_x) {
var dist = Math.ceil((final_x - xpos)/10)
xpos = xpos + dist
}
if (xpos >final_x) {
var dist = Math.ceil((xpos - final_x)/10)
xpos = xpos - dist
}
if (ypos <final_y) {
var dist = Math.ceil((final_y - ypos)/10)
ypos = ypos + dist
}
if (ypos >final_y) {
var dist = Math.ceil((ypos - final_y)/10)
ypos = ypos - dist
}
elem.style.left = xpos + "px"
elem.style.top = ypos + "px"
var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")"
elem.movement = setTimeout(repeat,interval)
}
function classNormal(iFocusBtnID,iFocusTxID){
var iFocusBtns= $(iFocusBtnID).getElementsByTagName('li')
var iFocusTxs = $(iFocusTxID).getElementsByTagName('li')
for(var i=0i<iFocusBtns.lengthi++) {
iFocusBtns[i].className='normal'
iFocusTxs[i].className='normal'
}
}
function classCurrent(iFocusBtnID,iFocusTxID,n){
var iFocusBtns= $(iFocusBtnID).getElementsByTagName('li')
var iFocusTxs = $(iFocusTxID).getElementsByTagName('li')
iFocusBtns[n].className='current'
iFocusTxs[n].className='current'
}
function iFocusChange() {
if(!$('ifocus')) return false
$('ifocus').onmouseover = function(){atuokey = true}
$('ifocus').onmouseout = function(){atuokey = false}
var iFocusBtns = $('ifocus_btn').getElementsByTagName('li')
var listLength = iFocusBtns.length
iFocusBtns[0].onmouseover = function() {
moveElement('ifocus_piclist',0,0,5)
classNormal('ifocus_btn','ifocus_tx')
classCurrent('ifocus_btn','ifocus_tx',0)
}
if (listLength>=2) {
iFocusBtns[1].onmouseover = function() {
moveElement('ifocus_piclist',0,-225,5)
classNormal('ifocus_btn','ifocus_tx')
classCurrent('ifocus_btn','ifocus_tx',1)
}
}
if (listLength>=3) {
iFocusBtns[2].onmouseover = function() {
moveElement('ifocus_piclist',0,-450,5)
classNormal('ifocus_btn','ifocus_tx')
classCurrent('ifocus_btn','ifocus_tx',2)
}
}
if (listLength>=4) {
iFocusBtns[3].onmouseover = function() {
moveElement('ifocus_piclist',0,-675,5)
classNormal('ifocus_btn','ifocus_tx')
classCurrent('ifocus_btn','ifocus_tx',3)
}
}
}
setInterval('autoiFocus()',3500)
var atuokey = false
function autoiFocus() {
if(!$('ifocus')) return false
if(atuokey) return false
var focusBtnList = $('ifocus_btn').getElementsByTagName('li')
var listLength = focusBtnList.length
for(var i=0i<listLengthi++) {
if (focusBtnList[i].className == 'current') var currentNum = i
}
if (currentNum==0&&listLength!=1 ){
moveElement('ifocus_piclist',0,-225,5)
classNormal('ifocus_btn','ifocus_tx')
classCurrent('ifocus_btn','ifocus_tx',1)
}
if (currentNum==1&&listLength!=2 ){
moveElement('ifocus_piclist',0,-450,5)
classNormal('ifocus_btn','ifocus_tx')
classCurrent('ifocus_btn','ifocus_tx',2)
}
if (currentNum==2&&listLength!=3 ){
moveElement('ifocus_piclist',0,-675,5)
classNormal('ifocus_btn','ifocus_tx')
classCurrent('ifocus_btn','ifocus_tx',3)
}
if (currentNum==3 ){
moveElement('ifocus_piclist',0,0,5)
classNormal('ifocus_btn','ifocus_tx')
classCurrent('ifocus_btn','ifocus_tx',0)
}
if (currentNum==1&&listLength==2 ){
moveElement('ifocus_piclist',0,0,5)
classNormal('ifocus_btn','ifocus_tx')
classCurrent('ifocus_btn','ifocus_tx',0)
}
if (currentNum==2&&listLength==3 ){
moveElement('ifocus_piclist',0,0,5)
classNormal('ifocus_btn','ifocus_tx')
classCurrent('ifocus_btn','ifocus_tx',0)
}
}
addLoadEvent(iFocusChange)
</script>
</head>
<body>
<br />
<div align="center">
<div id="ifocus">
<div id="ifocus_pic">
<div id="ifocus_piclist" style="left:0top:0">
<ul>
<li><a href="#" target="_blank"><img src="/edu/img/js/200909/1.jpg" alt="武林三国" border="0" /></a></li>
<li><a href="#" target="_blank"><img src="/edu/img/js/200909/2.jpg" alt="武林英雄" border="0" /></a></li>
<li><a href="#" target="_blank"><img src="/edu/img/js/200909/3.jpg" alt="商业大亨" border="0" /></a></li>
<li><a href="#" target="_blank"><img src="/edu/img/js/200909/4.jpg" alt="帝国远征" border="0" /></a></li>
</ul>
</div>
<div id="ifocus_opdiv"></div>
<div id="ifocus_tx">
<ul>
<li class="current">2008年度排名第一的网页游戏</li>
<li class="normal">2009年最新的网页游戏 </li>
<li class="normal">商业大亨，挑战亿万富翁</li>
<li class="normal">一款2009年不得不玩的帝国远征</li>
</ul>
</div>
</div>
<div id="ifocus_btn">
<ul>
<li class="current"><img src="/edu/img/js/200909/s1.jpg" alt="" /></li>
<li class="normal"><img src="/edu/img/js/200909/s2.jpg" alt="" /></li>
<li class="normal"><img src="/edu/img/js/200909/s3.jpg" alt="" /></li>
<li class="normal"><img src="/edu/img/js/200909/s4.jpg" alt="" /></li>
</ul>
</div>
</div>
</div>
</body>
</html>
自己改图片链接和大小~~
