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如何用js实现点击图片切换另一图片，再次点击恢复？
方法如下
html
head
meta http-equiv="Content-Type" content="text/html; charset=utf-8"
title/title
/head
body
script
window.onload=function(){
var Imgbtn=document.getElementById('btn');
var Img=document.getElementById('img');
Imgbtn.onclick=function(){
if(Img.src=='') {
Img.src='';
}else{
Img.src=''
}
}
}
/script
div id="bg"
div id="btn"
div id="txt"试客小兵/div
img id="img" src=""
/div
/div
/body
/html
扩展资料
JavaScript是一种脚本语言，其源代码在发往客户端运行之前不需经过编译，而是将文本格式的字符代码发送给浏览器由浏览器解释运行。
直译语言的弱点是安全性较差，而且在JavaScript中，如果一条运行不了，那么下面的语言也无法运行。而其解决办法就是于使用try{}catch(){}︰
Javascript被归类为直译语言，因为主流的引擎都是每次运行时加载代码并解译。V8是将所有代码解译后再开始运行，其他引擎则是逐行解译（SpiderMonkey会将解译过的指令暂存，以提高性能，称为实时编译），但由于V8的核心部份多数用Javascript撰写（而SpiderMonkey是用C++），因此在不同的测试上，两者性能互有优劣。
与其相对应的是编译语言，例如C语言，以编译语言编写的程序在运行之前，必须经过编译，将代码编译为机器码，再加以运行。
参考资料：百度百科 JavaScript编程
用js实现一个页面可以用键盘左右方向键控制两张图片切换
用js的 event.keyCode来获取方向键。
从网上你可以查到左右方向键对应的keyCode值，这样你就能获取到左右键点击事件了。
然后当左右键点击的时候，触发显示和隐藏对应图片的功能。
图片的显示和隐藏，你可以用js给对应的图片添加显示或者隐藏的css。
这样就能实现你要的效果了
JavaScript 的网页图片切换代码
!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" ""
html xmlns=""
head
meta http-equiv="Content-Type" content="text/html; charset=gb2312"
title网页特效 首页图片切换/title
style type="text/css"
/* Reset style */
* { margin:0; padding:0; word-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:#0287CA; text-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:normal; font-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:650px; height:245px; margin:0px; border:1px solid #DEDEDE; background:#F8F8F8; }
#ifocus_pic { display:inline; position:relative; float:left; width:540px; height:225px; overflow:hidden; margin:10px 0 0 10px; }
#ifocus_piclist { position:absolute; }
#ifocus_piclist li { width:550px; height:225px; overflow:hidden; }
#ifocus_piclist img { width:550px; height:225px; }
#ifocus_btn { display:inline; float:right; width:91px; margin:9px 9px 0 0; }
#ifocus_btn li { width:91px; height:57px; cursor:pointer; opacity:0.5; -moz-opacity:0.5; filter:alpha(opacity=50); }
#ifocus_btn img { width:75px; height:45px; margin:7px 0 0 11px; }
#ifocus_btn .current { background: url(img/ifocus_btn_bg.gif) no-repeat; opacity:1; -moz-opacity:1; filter:alpha(opacity=100); }
#ifocus_opdiv { position:absolute; left:0; bottom:0; width:545px; height:35px; background:#000; opacity:0.5; -moz-opacity:0.5; filter:alpha(opacity=50); }
#ifocus_tx { position:absolute; left:8px; bottom:8px; color:#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=0; iiFocusBtns.length; i++) {
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=0; ilistLength; i++) {
if (focusBtnList[i].className == 'current') var currentNum = i;
}
if (currentNum==0listLength!=1 ){
moveElement('ifocus_piclist',0,-225,5);
classNormal('ifocus_btn','ifocus_tx');
classCurrent('ifocus_btn','ifocus_tx',1);
}
if (currentNum==1listLength!=2 ){
moveElement('ifocus_piclist',0,-450,5);
classNormal('ifocus_btn','ifocus_tx');
classCurrent('ifocus_btn','ifocus_tx',2);
}
if (currentNum==2listLength!=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==1listLength==2 ){
moveElement('ifocus_piclist',0,0,5);
classNormal('ifocus_btn','ifocus_tx');
classCurrent('ifocus_btn','ifocus_tx',0);
}
if (currentNum==2listLength==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:0; top:0;"
ul
lia href="#" target="_blank"img src="/edu/img/js/200909/1.jpg" alt="武林三国" border="0" //a/li
lia href="#" target="_blank"img src="/edu/img/js/200909/2.jpg" alt="武林英雄" border="0" //a/li
lia href="#" target="_blank"img src="/edu/img/js/200909/3.jpg" alt="商业大亨" border="0" //a/li
lia 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~~
js如何点击左右按钮切换图片
这样：
!DOCTYPE html
html
head
meta charset="UTF-8"
title动态切换图片/title
/head
style
ul{
padding:0;margin:0;
}
li{
list-style: none;
}
#pic{
position: relative;
width: 400px;
height: 400px;
background-color:red;
margin:100px auto;
background:url('image/1.jpg') no-repeat center;
}
#pic img{
width: 400px;
height: 400px;
}
#pic ul{
width: 50px;
position: absolute;
top: 0;
right: -70px;
}
li{
width: 40px;
height: 40px;
margin-bottom:10px;
background-color: pink;
float: left;
}
#pic span{
position: absolute;
bottom: 10px;
left: 0;
}
#pic p,#pic span{
width: 400px;
height: 20px;
}
#pic p{
position: absolute;
top: 10px;
left: 0;
}
.active{
background-color: red;
}
/style
body
div id="pic"
img src="" alt=""
pqwrwe/p
spanwerwer/span
ul
/ul
/div
script
window.onload=function(){
//存放旧li
var oldLi=null;
var num=0;
var oPic = document.getElementById('pic');
var oImg = oPic.getElementsByTagName('img')[0];
var oUL = oPic.getElementsByTagName('ul')[0];
var oSpan= oPic.getElementsByTagName('span')[0];
var oP = oPic.getElementsByTagName('p')[0];
var oLi= oUL.getElementsByTagName('li');
var arr=['image/1.jpg','image/2.jpg','image/3.jpg','image/4.jpg'];
var aText = ['图片1','图片2','图片3','图片4'];
for(var i=0;iarr.length;i++){
//动态添加元素
oUL.innerHTML+='li/li';
}
// 旧li就等于当前的
oldLi=oLi[num];
// 初始化
oImg.src=arr[num];
oP.innerHTML=num+1+'/'+arr.length;
oSpan.innerHTML=aText[num];
oLi[num].className='active';
for(var i=0;iarr.length;i++){
// 给元素自定义属性
//
oLi[i].index=i;
oLi[i].onclick=function(){
// 当元素被点击时图片文字信息都一起变化
oImg.src=arr[this.index];
oP.innerHTML=1+this.index+'/'+arr.length;
oSpan.innerHTML=aText[this.index];
// 清空上一个 当前添加
oldLi.className='';
//将上一个给当前
oldLi=this;
this.className='active';
}
}
}
/script
/body
/html
扩展资料：
注意事项
1、可以通过JS删除和添加hidden属性，改用style.display="none"和style.display="inline"来实现隐藏和显示。
2、button属性，主要的问题时button样式的问题，如何才能做一个好看的button，通过查找找到了设置button相关的值。
border:none; 设置按钮无边框
outline:none;消除按钮点击后出现的表示被点击的边框
background：url(...)按钮背景图片
text-shadow: 0 1px 1px rgba(0,0,0,.3);文字阴影
box-shadow: 0 5px 7px rgba(0,0,0,.2);按钮阴影
border-radius:15px;按钮边框圆角