效果图
直接放代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>cat</title>
<link rel="stylesheet" href="../css/base.css">
<link rel="stylesheet" href="../css/cat.css">
</head>
<body>
<div class="content">
<div class="container">
<div id="cat" class="cat">
<a href="#" class="cat-title"><i class="cart-icon">#</i>商品分类</a>
<div class="cat-item dropdown" data-active="cat" data-load="../js/cat-1.json">
<div class="dropdown-toggle">
<a href="#" class="cat-item-link">家用电器</a>
<span class="dropdown-arrow cat-arrow">></span>
</div>
<div class="dropdown-list">
<div class="dropdown-loading"></div>
</div>
</div>
<div class="cat-item dropdown" data-active="cat" data-load="../js/cat-2.json">
<div class="dropdown-toggle">
<a href="#" class="cat-item-link">手机、运营商、数码</a>
<span class="dropdown-arrow cat-arrow">></span>
</div>
<div class="dropdown-list">
<div class="dropdown-loading"></div>
</div>
</div>
<div class="cat-item dropdown" data-active="cat" data-load="../js/cat-3.json">
<div class="dropdown-toggle">
<a href="#" class="cat-item-link">电脑、办公</a>
<span class="dropdown-arrow cat-arrow">></span>
</div>
<div class="dropdown-list">
<div class="dropdown-loading"></div>
</div>
</div>
<div class="cat-item dropdown" data-active="cat" data-load="../js/cat-4.json">
<div class="dropdown-toggle">
<a href="#" class="cat-item-link">家居、家具、家装、厨具</a>
<span class="dropdown-arrow cat-arrow">></span>
</div>
<div class="dropdown-list">
<div class="dropdown-loading"></div>
</div>
</div>
</div>
</div>
</div>
<script src="../js/jquery.js"></script>
<script src="../js/transition.js"></script>
<script src="../js/showhide.js"></script>
<script src="../js/dropdown.js"></script>
<script src="../js/cat.js"></script>
</body>
</html>
base.css https://www.cnblogs.com/chenyingying0/p/12363689.html
cat.css
/*公共样式 */
.container{
width:1200px;
margin:0 auto;
}
.link{
color:#4d555d;
}
a.link:hover{
color:#f01414;
}
.fl{
float:left;
}
.fr{
float:right;
}
/*提取出过渡样式，可公用*/
.transition{
-webkit-transition:all .5s;
-moz-transition:all .5s;
-ms-transition:all .5s;
-o-transition:all .5s;
transition:all .5s;
}
/*文字隐藏*/
.text-hidden{
text-indent:-9999px;
overflow:hidden;
}
/*文字溢出省略显示*/
.text-ellipsis{
overflow: hidden;
white-space: nowrap;
text-overflow:ellipsis;
}
/*dropdown下拉组件*/
.dropdown{
position: relative;
}
.dropdown-toggle{
position: relative;
z-index:4;
}
.dropdown-arrow{
display: inline-block;
vertical-align: middle;
background-repeat: no-repeat;
line-height:1;/*否则图标字体会继承父元素的line-height属性，占据过多空间*/
}
.dropdown-list{
display: none;
position: absolute;
z-index:3;
}
.dropdown-left{
left:0;
right:auto;
}
.dropdown-right{
right:0;
left:auto;
}
.dropdown-loading{
width:32px;
height:32px;
background:url(../img/loading.gif) no-repeat;
margin:20px;
}
/*showhide*/
.fadeOut{
opacity: 0;
visibility: hidden;
}
.slideUpDownCollapse{
height:0 !important;/*避免因为优先级不够而无法生效*/
padding-top:0 !important;
padding-bottom:0 !important;
}
.slideLeftRightCollapse{
width:0 !important;/*避免因为优先级不够而无法生效*/
padding-left:0 !important;
padding-right:0 !important;
}
/*侧导航*/
.cat{
width:209px;
height:566px;
background-color:#f01414;
position: absolute;
top: -54px;
z-index: 5;
}
.cat-title{
display: inline-block;
width:165px;
height:54px;
line-height:54px;
color:#fff;
font-size:14px;
padding:0 22px;
background-color:#c81414;
}
.cart-icon{
color:#fff;
font-style:normal;
font-size:18px;
margin-right:8px;
}
.cat-item{
height:37px;
line-height: 37px;
padding-left:18px;
color:#fff;
border-left:1px solid #f01414;
border-right:1px solid #f01414;
position: static;/*覆盖掉之前的relative定位，使右边list相对于整个大容器进行顶部对齐*/
}
.cat-arrow{
position: absolute;
right: 20px;
top: 9px;
}
.cat-item-link{
color:#fff;
}
.cat .dropdown-loading{
margin:220px auto 0;
}
.cat .dropdown-list{
position: absolute;
left:209px;
top:54px;
background:#fff;
width:500px;
box-shadow:0 0 5px rgba(0,0,0,.2);
padding:20px;
height:472px;
overflow:hidden;
}
.dropdown-list-item{
width:500px !important;
display: block;
margin:24px 0;
line-height:20px;
}
.dropdown-list-item-title{
display: block;
float:left;
width:84px;
padding-right:16px;
border-right:1px solid #333;
text-align:right;
font-weight:bold;
}
.dropdown-list-item-txt{
display: inline-block;
padding-left:15px;
width:380px;
}
.dropdown-list-item-txt a{
margin-right:16px;
display: inline-block;/*否则内联元素换行时文字会被拆开*/
}
/*激活样式*/
.cat-active.cat-item{
background-color:#fff;
color:#f01414;
}
.cat-active .cat-item-link{
color:#f01414;
}
.cat-active .dropdown-list{
display:block;
}
jquery.js
transition.js https://www.cnblogs.com/chenyingying0/p/12363649.html
showhide.js https://www.cnblogs.com/chenyingying0/p/12363707.html
dropdown.js https://www.cnblogs.com/chenyingying0/p/12363739.html
cat.js
// 不要暴露在全局，使用匿名函数自执行
(function($){
"use strict";
//cat
$("#cat").find(".dropdown").on("dropdown-show",function(e){
loadOnce($(this),buildCatItem);
}).dropdown({
css3:true,
js:true,
animation:"slideLeftRight"
});
//创建cat的item结构
function buildCatItem($elem,data){
var list=$elem.find(".dropdown-list");
var html="";
if(data.length===0) return;
html=``;
for(var i=0;i<data.length;i++){
html+=`<dl class="dropdown-list-item">
<dt class="dropdown-list-item-title">
<a href="#">`+data[i].title+`</a>
</dt>
<dd class="dropdown-list-item-txt">`;
for(var j=0;j<data[i].items.length;j++){
html+=`<a href="#">`+data[i].items[j]+`</a>`;
}
html+=`</dd></dl>`;
}
list.html(html);
}
//加载一次数据
function loadOnce($elem,success){
var dataLoad=$elem.data("load");
if(!dataLoad) return;
if(!$elem.data("loaded")){
$elem.data("loaded",true);
$.getJSON(dataLoad).done(function(data){
success($elem,data);
}).fail(function(){
$elem.data("loaded",false);
});
}
}
})(jQuery);
来源：https://www.cnblogs.com/chenyingying0/p/12364170.html