dedecms怎么做下拉菜单

dedecms做下拉菜单：

将下面这段代码贴到templetsdefaultfooter.htm文件里<!-- //二级子类下拉菜单，考虑SEO原因放置于底部 --><script type='text/javascript' alt="dedecms怎么做下拉菜单" src='{dede:global.cfg_cmsurl/}/images/js/dropdown.js'></script>{dede:channelartlist typeid='top' cacheid='channelsonlist'}<ul id="dropmenu{dede:field.typeid/}">以上代码可以看出，二级子类下拉菜单是由dropdown.js控制的，我们来看dropdown.js文件：

由以上的cssdropdown.startchrome("navMenu")，可以看出我们调用的是startchrome:function()var cssdropdown={disappeardelay: 250, disablemenuclick: false, enableswipe: 1, enableiframeshim: 1, dropmenuobj: null, ie: document.all, firefox: document.getElementById&&!document.all, swipetimer: undefined, bottomclip:0, getposOffset:function(what, offsettype){var totaloffset=(offsettype=="left")? what.offsetLeft : what.offsetTop;var parentEl=what.offsetParent;while (parentEl!=null){totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;parentEl=parentEl.offsetParent;}return totaloffset;}, swipeeffect:function(){if (this.bottomclip<parseInt(this.dropmenuobj.offsetHeight)){this.bottomclip+=10+(this.bottomclip/10) this.dropmenuobj.style.clip="rect(0 auto "+this.bottomclip+"px 0)"}elsereturnthis.swipetimer=setTimeout("cssdropdown.swipeeffect()", 10)}, showhide:function(obj, e){if (this.ie || this.firefox)this.dropmenuobj.style.left=this.dropmenuobj.style.top="-500px"if (e.type=="click" && obj.visibility==hidden || e.type=="mouseover"){if (this.enableswipe==1){if (typeof this.swipetimer!="undefined")clearTimeout(this.swipetimer)obj.clip="rect(0 auto 0 0)" this.bottomclip=0this.swipeeffect()}obj.visibility="visible"}else if (e.type=="click")obj.visibility="hidden"}, iecompattest:function(){return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body}, clearbrowseredge:function(obj, whichedge){var edgeoffset=0if (whichedge=="rightedge"){var windowedge=this.ie && !window.opera? this.iecompattest().scrollLeft+this.iecompattest().clientWidth-15 : window.pageXOffset+window.innerWidth-15this.dropmenuobj.contentmeasure=this.dropmenuobj.offsetWidthif (windowedge-this.dropmenuobj.x < this.dropmenuobj.contentmeasure)edgeoffset=this.dropmenuobj.contentmeasure-obj.offsetWidth}else{var topedge=this.ie && !window.opera? this.iecompattest().scrollTop : window.pageYOffsetvar windowedge=this.ie && !window.opera? this.iecompattest().scrollTop+this.iecompattest().clientHeight-15 : window.pageYOffset+window.innerHeight-18this.dropmenuobj.contentmeasure=this.dropmenuobj.offsetHeightif (windowedge-this.dropmenuobj.y < this.dropmenuobj.contentmeasure){ edgeoffset=this.dropmenuobj.contentmeasure+obj.offsetHeightif ((this.dropmenuobj.y-topedge)<this.dropmenuobj.contentmeasure) edgeoffset=this.dropmenuobj.y+obj.offsetHeight-topedge}}return edgeoffset}, dropit:function(obj, e, dropmenuID){if (this.dropmenuobj!=null) this.dropmenuobj.style.visibility="hidden" this.clearhidemenu()if (this.ie||this.firefox){obj.οnmοuseοut=function(){cssdropdown.delayhidemenu()}obj.οnclick=function(){return !cssdropdown.disablemenuclick} this.dropmenuobj=document.getElementById(dropmenuID)if(!this.dropmenuobj) return;this.dropmenuobj.οnmοuseοver=function(){cssdropdown.clearhidemenu()}this.dropmenuobj.οnmοuseοut=function(e){cssdropdown.dynamichide(e)}this.dropmenuobj.οnclick=function(){cssdropdown.delayhidemenu()}this.showhide(this.dropmenuobj.style, e)this.dropmenuobj.x=this.getposOffset(obj, "left")this.dropmenuobj.y=this.getposOffset(obj, "top")this.dropmenuobj.style.left=this.dropmenuobj.x-this.clearbrowseredge(obj, "rightedge")+"px"this.dropmenuobj.style.top=this.dropmenuobj.y-this.clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+1+"px"this.positionshim() }}, positionshim:function(){ if (this.enableiframeshim && typeof this.shimobject!="undefined"){if (this.dropmenuobj.style.visibility=="visible"){this.shimobject.style.width=this.dropmenuobj.offsetWidth+"px"this.shimobject.style.height=this.dropmenuobj.offsetHeight+"px"this.shimobject.style.left=this.dropmenuobj.style.leftthis.shimobject.style.top=this.dropmenuobj.style.top}this.shimobject.style.display=(this.dropmenuobj.style.visibility=="visible")? "block" : "none"}}, hideshim:function(){if (this.enableiframeshim && typeof this.shimobject!="undefined")this.shimobject.style.display='none'}, contains_firefox:function(a, b) {while (b.parentNode)if ((b = b.parentNode) == a)return true;return false;}, dynamichide:function(e){var evtobj=window.event? window.event : eif (this.ie&&!this.dropmenuobj.contains(evtobj.toElement))this.delayhidemenu()else if (this.firefox&&e.currentTarget!= evtobj.relatedTarget&& !this.contains_firefox(evtobj.currentTarget, evtobj.relatedTarget))this.delayhidemenu()}, delayhidemenu:function(){this.delayhide=setTimeout("cssdropdown.dropmenuobj.style.visibility='hidden'; cssdropdown.hideshim()",this.disappeardelay) }, clearhidemenu:function(){if (this.delayhide!="undefined")clearTimeout(this.delayhide)}, startchrome:function(){for (var ids=0; ids<arguments.length; ids++){var menuitems=document.getElementById(arguments[ids]).getElementsByTagName("a")for (var i=0; i<menuitems.length; i++){if (menuitems[i].getAttribute("rel")){var relvalue=menuitems[i].getAttribute("rel")menuitems[i].οnmοuseοver=function(e){var event=typeof e!="undefined"? e : window.eventcssdropdown.dropit(this,event,this.getAttribute("rel"))}}}}if (window.createPopup && !window.XmlHttpRequest){ document.write('<IFRAME id="iframeshim"src="" style="display: none; left: 0; top: 0; z-index: 90; position: absolute; filter: progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)" frameBorder="0" scrolling="no"></IFRAME>')this.shimobject=document.getElementById("iframeshim") }}}由上可以看出，var cssdropdown变量中有多个函数：getposOffset:function(what, offsettype)swipeeffect:function()showhide:function(obj, e) iecompattest:function()clearbrowseredge:function(obj, whichedge)dropit:function(obj, e, dropmenuID)positionshim:function()hideshim:function()dynamichide:function(e)delayhidemenu:function()clearhidemenu:function()startchrome:function()更新一下！会发现导航栏已经出现下拉菜单了，只是背景是透明的，原因是没有背景图片。

然后我们可以对此下拉菜单添加背景图片和设置css样式。

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