时间：2021-07-01 10:21:17 帮助过：4人阅读
IE兼容性没处理，确切的说不太会，还望指点一二
思路：
1、js获取要给定点击事件的按钮组对象，如btns=document.xxx(),遍历过程绑定事件之前先取得当前对象的下标eg:btns[i].index=i;
2、匹配index为将要显示的DOM对象
3、点击过程中要切换class，先判断是否含有指定class，有就删除，没有就添加指定class。注:if(!null)为真.
4、onmouseover同理
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="css/index.css">
<script src="js/index-banner.js"></script>
</head>
<body>
<h3>javascript切换效果</h3>
<section>
<div class="baner_parent">
<div class="will_left btn_left">
<ul>
<li data-i="0" class="selected js_btn"><img src="img/Ferrari.png"><span>法拉利</span></li>
<li data-i="1" class="js_btn"><img src="img/Mercedes1.png"><span>奔驰</span></li>
<li data-i="2" class="js_btn"><img src="img/BMW.png"><span>宝马</span></li>
<li data-i="3" class="js_btn"><img src="img/Audi.png"><span>奥迪</span></li>
</ul>
</div>
<div class="will_left banner_right">
<!--法拉利-->
<div class="banner_lists">
<img src="img/ferrari01.jpg" alt="">
<ul>
<li class="will_left btn selected">法拉利1</li>
<li class="will_left btn">法拉利2</li>
<li class="will_left btn">法拉利3</li>
<li class="will_left btn">法拉利4</li>
</ul>
</div>
<!--奔驰-->
<div class="banner_lists">
<img src="img/benchi01.jpg" alt="">
<ul>
<li class="will_left btn selected">奔驰1</li>
<li class="will_left btn">奔驰2</li>
<li class="will_left btn">奔驰3</li>
<li class="will_left btn">奔驰4</li>
</ul>
</div>
<!--宝马-->
<div class="banner_lists">
<img src="img/baoma01.jpg" alt="">
<ul>
<li class="will_left btn selected">宝马1</li>
<li class="will_left btn">宝马2</li>
<li class="will_left btn">宝马3</li>
<li class="will_left btn">宝马4</li>
</ul>
</div>
<!--奥迪-->
<div class="banner_lists">
<img src="img/aodi01.jpg" alt="">
<ul>
<li class="will_left btn selected">奥迪1</li>
<li class="will_left btn">奥迪2</li>
<li class="will_left btn">奥迪3</li>
<li class="will_left btn">奥迪4</li>
</ul>
</div>
</div>
</div>
</section>
</body>
</html>
CSS
*{
list-style: none;
border:none;
text-decoration: none;
margin:0;
padding:0;
box-sizing: border-box;
}
h3{
text-align: center;
color: dimgrey;
}
.baner_parent{
width: 1000px;
margin:0 auto;
}
.will_left{
float: left;
}
.will_right{
float: right;
}
.btn_left ul li{
text-align: center;
width: 160px;
height:98px;
background-color: darkgrey;
padding: 13px 0;
cursor: pointer;
-webkit-transition:all .5s ease-out;
-moz-transition:all .5s ease-out;
-o-transition:all .5s ease-out;
-ms-transition:all .5s ease-out;
transition:all .5s ease-out;
}
.btn_left ul li.selected{
background-color: cornflowerblue;
}
.btn_left ul li:not(:nth-child(4)){
border-bottom: 1px solid dimgrey;
}
.btn_left ul li img{
width: 50px;
height: 50px;
}
.btn_left ul li span{
display:block;
}
.banner_right,.banner_lists img{
width: 800px;
height: 391px;
position: relative;
}
.banner_lists{
position: absolute;
height: 391px;
}
.banner_lists:not(:nth-child(1)){
display: none;
}
.banner_lists ul{
overflow: hidden;
position: absolute;
bottom: 0;
left: 0;
}
.btn{
height: 33px;
width: 200px;
border-right: 1px solid #000;
margin-top: -3px;
text-align: center;
line-height: 33px;
background-color: darkgrey;
opacity: .8;
cursor: pointer;
-webkit-transition:all .5s ease-out;
-moz-transition:all .5s ease-out;
-o-transition:all .5s ease-out;
-ms-transition:all .5s ease-out;
transition:all .5s ease-out;
}
.btn:hover,.btn.selected{
background-color: cornflowerblue;
}
JS
/**
* Created by Administrator on 2016/4/30 0030.
* blog:wjf444128852.github.io
* 不支持IE
*/
window.onload=function(){
var arrFR = ['img/ferrari01.jpg','img/ferrari02.jpg','img/ferrari03.jpg','img/ferrari04.jpg'];
var arrBC = ['img/benchi01.jpg','img/benchi02.jpg','img/benchi03.jpg','img/benchi04.jpg'];
var arrBM = ['img/baoma01.jpg','img/baoma02.jpg','img/baoma03.jpg','img/baoma04.jpg'];
var arrAD = ['img/aodi01.jpg','img/aodi02.jpg','img/aodi03.jpg','img/aodi04.jpg'];
var array = [arrFR,arrBC,arrBM,arrAD];
var btns=document.getElementsByClassName('js_btn');
var divList=document.getElementsByClassName('banner_lists');
// 品牌切换
for(var i=0;i<btns.length;i++){
btns[i].index=i;
btns[i].onclick=showItems;
}
//ClassName切换,是否含有指定class
function hasClass(elem,cls){
return elem.className.match(new RegExp('(\\s|^)'+cls+'(\\s|$)'));
}
// 没有就追加指定class
function addClass(elem,cls){
if(!hasClass(elem,cls)){
elem.className+=" "+cls;
}
}
// 有就移除指定class
function removeClass(elem,cls){
if(hasClass(elem,cls)){
var reg=new RegExp('(\\s|^)'+cls+'(\\s|$)');
elem.className=elem.className.replace(reg,"");
}
}
//ClassName切换,移除所有
function removeAll(obj){
for (var i = 0; i < obj.length; i++) {
removeClass(obj[i],"selected");
}
}
// DIV显示切换
function showItems(){
removeAll(btns);
addClass(this,"selected");
for (var s = 0; s< divList.length; s++) {
divList[s].style.display="none";
divList[this.index].style.display="block";
}
willHover(this.index);
}
// 右边切换按钮效果
function willHover(sum){
var hoverbtns=divList[sum].getElementsByClassName('btn');
var img=divList[sum].getElementsByTagName('img')[0];
for (var i = 0; i < hoverbtns.length; i++) {
hoverbtns[i].index=i;
hoverbtns[i].onmouseover=function(){
removeAll(hoverbtns);
addClass(this,"selected");
var imgSrc=array[sum][this.index];
img.src=array[sum][this.index];
}
}
}
// 默认第一次可以切换
willHover(0);
};
以上就是本文的全部内容，希望对大家的学习有所帮助。