这是一款原生JS实现的仿淘宝网左侧商品分类菜单效果代码，JavaScript技术实现，兼容各主流浏览器。自己再修改一下CSS菜单，它会变得更漂亮。
运行效果截图如下：
在线演示地址如下：
具体代码如下：
<!DOCTYPE html> <head> <title>仿淘宝网左侧的商品分类菜单代码</title> </head> <body> <style> html{color:#000;background:#FFF}body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,input,button,textarea,select,p,blockquote,th,td{margin:0;padding:0}table{border-collapse:collapse;border-spacing:0}fieldset,img{border:0}address,button,caption,cite,code,dfn,em,input,optgroup,option,select,strong,textarea,th,var{font:inherit}del,ins{text-decoration:none}li{list-style:none}caption,th{text-align:left}h1,h2,h3,h4,h5,h6{font-size:100%;font-weight:normal}q:before,q:after{content:''}abbr,acronym{border:0;font-variant:normal}sup{vertical-align:baseline}sub{vertical-align:baseline}legend{color:#000} .hidden{display:none;} .sub-col{position:relative;z-index:999;} .category{width:230px;border:1px solid #8A0E00;} .category h3 {height:30px;line-height:30px;text-indent:15px;background:#A91319;color:#fff;} .category ul li{height:30px;line-height:30px;text-indent:35px;background:#FFF8F6 url(arrow-r.png) no-repeat 205px center;border-bottom:1px solid #ECECEC;border-top:1px solid #fff;cursor:pointer;color:#A71F37;} .category ul li:hover{background-color:#8A0E00;color:#fff;} .pop-category{border:2px solid #8A0E00;background:#FDF5F5;position:absolute;left:200px;top:40px;z-index:1000;} .pop-category .sub-item{width:390px;height:350px;} </style> <div> <div> <div> <h3>所有商品分类</h3> <ul> <li>潮流服饰</li> <li>精品鞋包</li> <li>美容护肤</li> <li>珠宝饰品</li> <li>运动户外</li> <li>手机数码</li> <li>居家生活</li> <li>家电家装</li> <li>母婴用品</li> <li>食品保健</li> </ul> <div> <div>潮流服饰</div> <div>精品鞋包</div> <div>美容护肤</div> <div>珠宝饰品</div> <div>运动户外</div> <div>手机数码</div> <div>居家生活</div> <div>家电家装</div> <div>母婴用品</div> <div>食品保健</div> </div> </div> </div> </div> <script type="text/javascript"> //get element's id with '$(id)' method function $(){ var elements = new Array(); for (var i = 0; i < arguments.length; i++) { var element = arguments[i]; if (typeof element == 'string') element = document.getElementById(element); if (arguments.length == 1) return element; elements.push(element); } return elements; } //get ele's className function getElementsByClassName(className, tagName){ var ele = [], all = document.getElementsByTagName(tagName || '*'); for (var i = 0; i < all.length; i++) { if (all[i].className == className) { ele[ele.length] = all[i]; } } return ele; } </script> <script type='text/javascript'> var category=$('J_category'),popCategory=$('J_popCategory'), cateLi=category.getElementsByTagName('li'),subItems=getElementsByClassName('sub-item','div'); category.onmouseover=function(){ popCategory.style.display='block'; }; category.onmouseout=function(){ popCategory.style.display='none'; }; for(var i=0; i<cateLi.length; i++){ cateLi[i].index=i; cateLi[i].onmouseover=function(){ for(var j=0; j<subItems.length; j++){ subItems[j].style.display='none'; } subItems[this.index].style.display='block'; }; } </script> </body> </html>