本文实例讲述了JS实现光滑展开合拢的菜单效果代码。分享给大家供大家参考。具体如下：
这是一个光滑展开又合拢的JS菜单效果，无jQuery插件，完全JavaScript代码实现，没有过多修饰，有兴趣的美化一下，肯定是款不错的折叠菜单。
运行效果截图如下：
在线演示地址如下：
http://demo.jb51.net/js/2015/js-swift-fade-in-out-menu-style-codes/
具体代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3c.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html><head><meta http-equiv="Content-Type" content="html/txt; charset=utf-8" /><title>光滑展开合拢的JS菜单效果</title><style>*{margin:0;padding:0;}ul,li{list-style:none;}#con{width:164px; margin:50px auto 0;}#con h4.top{ height:4px; width:164px; overflow:hidden;}#con h4.bottom{height:4px; width:164px;overflow:hidden;}#con div{height:0px; overflow:hidden;}#con h3{border-top:2px solid #fff; border-bottom:1px solid #D6EFFF;}</style><script language="javascript">var speed = 30;var oCon = null; var oH3List = null;var oDivList = null;var oUlList = null;var oldNum = null;var clickNum = null;var hideTimer=null;var showTimer=null;window.onload=function(){ oCon = document.getElementById("con"); oH3List = oCon.getElementsByTagName("h3"); oUlList = oCon.getElementsByTagName("ul"); oDivList = oCon.getElementsByTagName("div"); for(var i=0;i<oUlList.length;i++){ oH3List[i].xuhao=i; oH3List[i].onclick=function(){ clickNum =this.xuhao; changeCatalog(); }; }} function changeCatalog(){ var old_num_2,click_num_2; old_num_2 = null; click_num_2= null; if(oldNum==null){ click_Num_2=clickNum; showTimer = setInterval("showUl("+click_Num_2+")",speed); }else if(oldNum == clickNum){ old_num_2=oldNum; hideTimer = setInterval("hideUl("+old_num_2+")",speed); }else{ old_num_2=oldNum; click_num_2=clickNum; hideTimer = setInterval("hideUl("+old_num_2+")",speed); showTimer = setInterval("showUl("+click_num_2+")",speed); }}function showUl(num){ var move_num1 =Math.ceil((oUlList[num].offsetHeight-oDivList[num].offsetHeight)/10); if(move_num1>=1){ oDivList[num].style.height = oDivList[num].offsetHeight+move_num1+"px"; }else{ oldNum=num; clearInterval(showTimer); }}function hideUl(num){ var move_num2=Math.ceil((oDivList[num].offsetHeight)/10); if(move_num2>0){ oDivList[num].style.height=oDivList[num].offsetHeight -move_num2+"px"; }else{ clearInterval(hideTimer); if(clickNum==num){ oldNum=null; } }}</script></head> <body><div id="con"> <h4 class="top"></h4> <h1></h1> <h3>设计素材</h3> <div> <ul> <li>精品图标</li> <li>图片幻灯</li> <li>网页播放器</li> </ul> </div> <h3>模板素材</h3> <div> <ul> <li>企业网站</li> <li>儿童网站</li> <li>音乐网站</li> <li>Discuz模板</li> </ul> </div> <h3>脚本下载</h3> <div> <ul> <li>jQuery</li> <li>Ajax</li> <li>PHP</li> </ul> </div> <h3>网页特效</h3> <div> <ul> <li>菜单</li> <li>表单</li> <li>浏览器</li> </ul> </div> <h4 class="bottom"></h4></div> </body></html>希望本文所述对大家的JavaScript程序设计有所帮助。
零七网部分新闻及文章转载自互联网，供读者交流和学习，若有涉及作者版权等问题请及时与我们联系，以便更正、删除或按规定办理。感谢所有提供资讯的网站，欢迎各类媒体与零七网进行文章共享合作。
