這是一款效果個(gè)性的JS+CSS導(dǎo)航菜單，鼠標(biāo)經(jīng)過(guò)時(shí)出現(xiàn)有趣弧形背景，實(shí)際上，這里用CSS調(diào)用了背景，用JavaScript控制了背景的移動(dòng)，用jQuery實(shí)現(xiàn)過(guò)類似的功能，整體感覺(jué)很不錯(cuò)。

運(yùn)行效果截圖如下：

在線演示地址如下：

http://demo.jb51.net/js/2015/js-css-cicle-cha-nav-menu-demo/

具體代碼如下：

<!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>圓弧背景的導(dǎo)航菜單</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 class="div_menu">
 <ul class="ul_menu" id="ul_menu">
 <li><a href="#">歡迎光臨</a></li>
 <li><a href="#">最新更新</a></li>
 <li><a href="#">下載排行</a></li>
 <li><a href="#">網(wǎng)頁(yè)特效</a></li>
 <li><a href="#">廣告聯(lián)系</a></li>
 </ul>
</div>
</body>
</html>

希望本文所述對(duì)大家的JavaScript程序設(shè)計(jì)有所幫助。

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