本文实例讲述了JS实现带圆弧背景渐变效果的导航菜单代码。分享给大家供大家参考。具体如下：
这是一款效果个性的JS+CSS导航菜单，鼠标经过时出现有趣弧形背景，实际上，这里用CSS调用了背景，用JavaScript控制了背景的移动，用jQuery实现过类似的功能，整体感觉很不错。
运行效果截图如下：
在线演示地址如下：
http://demo.jb51.net/js/2015/js-css-cicle-cha-nav-menu-demo/
具体代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>圆弧背景的导航菜单</title> <meta http-equiv="content-type" content="text/html;charset=gb2312"> <style type="text/css"> *{margin:0px;padding:0px;font-size:12px;} .div_menu{ position:absolute;left:100px;top:100px;} .ul_menu{list-style:none;} .ul_menu li{float:left;margin-left:1px;border:1px solid #33CCCC;display:block;padding:5px 3px;background:url(images/menu_bg.gif) repeat-x 0px -80px;padding:2px 12px;} .ul_menu li a{height:40px;width:auto;color:#ffffff;font-size:20px;font-weight:600;text-decoration:none;} </style> <script type="text/javascript"> var isIE = (document.all)?true:false; var $ID = function(id){ return "string"==typeof id?document.getElementById(id):id; } var Class = { create:function(){ return function(){ this.initilize.apply(this,arguments); } } } var Extend = function(destination, source){ for(var property in source){ destination[property] = source[property]; } } var Bind = function(object,fun){ var args = Array.prototype.slice.call(arguments).slice(2); return function(){ return fun.apply(object,args); } } var BindAsEventListener = function(object,fun){ var args = Array.prototype.slice.call(arguments).slice(2); return function(event){ return fun.apply(object,[event||window.event].concat(args)); } } function addEventHandler(oTarget, sEventType, fnHandler) { if (oTarget.addEventListener) { oTarget.addEventListener(sEventType, fnHandler, false); } else if (oTarget.attachEvent) { oTarget.attachEvent("on" + sEventType, fnHandler); } else { oTarget["on" + sEventType] = fnHandler; } }; function removeEventHandler(oTarget, sEventType, fnHandler) { if (oTarget.removeEventListener) { oTarget.removeEventListener(sEventType, fnHandler, false); } else if (oTarget.detachEvent) { oTarget.detachEvent("on" + sEventType, fnHandler); } else { oTarget["on" + sEventType] = null; } }; </script> <script type="text/javascript"> var MyMenu = Class.create(); MyMenu.prototype = { initilize:function(ul){ this.lis = ul.getElementsByTagName("li"); for(var i=0;i<this.lis.length;i++){ new BgChange(this.lis[i]); } } } var BgChange = Class.create(); BgChange.prototype = { initilize:function(li){ this.li = li; this._fnMouseOver = Bind(this,this.MouseOver); this._fnMouseOut = Bind(this,this.MouseOut); addEventHandler(this.li,"mouseover",this._fnMouseOver); addEventHandler(this.li,"mouseout",this._fnMouseOut); this.timer = null; this.i = -80; }, MouseOver:function(){ this.Stop(); this.i+=2; if(this.i>=0){ window.clearTimeout(this.timer); this.i = 0; }else{ this.ShowBg(); this.timer = window.setTimeout(this._fnMouseOver,10); } }, MouseOut:function(){ this.Stop(); this.i-=2; if(this.i<=-80){ window.clearTimeout(this.timer); this.i = -80; }else{ this.ShowBg(); this.timer = window.setTimeout(this._fnMouseOut,10); } }, ShowBg:function(){ this.li.style.backgroundPosition = "0px " + this.i + "px"; }, Stop:function(){ if(this.timer){ window.clearTimeout(this.timer); } } } onload = function(){ new MyMenu($ID("ul_menu")); } </script> </head> <body> <div> <ul id="ul_menu"> <li><a href="#">欢迎光临</a></li> <li><a href="#">最新更新</a></li> <li><a href="#">下载排行</a></li> <li><a href="#">网页特效</a></li> <li><a href="#">广告联系</a></li> </ul> </div> </body> </html>
希望本文所述对大家的JavaScript程序设计有所帮助。
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