基于jQuery弹性滑动导航菜单效果代码

body{ font-size:100%; font-family:"Microsoft YaHei","Arial"; background:#fff;}
#nav{ position:relative; width:573px; _width:576px; margin:100px auto 0 auto; border-bottom:2px #ddd solid;}
#nav .nav-menu{ height:50px;}
#nav .nav-menu a{ display:block; float:left; height:50px; padding:0 40px; line-height:50px; color:#666; font-size:16px; text-decoration:none;}
#nav .nav-current{ position:absolute; bottom:-2px; height:2px; overflow:hidden; background:#80b600;}

$(function(){
(function(){
var $navcur = $(".nav-current");
var $nav = $("#nav");
var current = ".current";
var itemW = $nav.find(current).innerWidth(); //默认当前位置宽度
var defLeftW = $nav.find(current).position().left; //默认当前位置Left值

//添加默认下划线
$navcur.css({width:itemW,left:defLeftW});

//hover事件
$nav.find("a").hover(function(){
var index = $(this).index(); //获取滑过元素索引值
var leftW = $(this).position().left; //获取滑过元素Left值
var currentW = $nav.find("a").eq(index).innerWidth(); //获取滑过元素Width值
$navcur.stop().animate({
left: leftW,
width: currentW
},300);

},function(){
$navcur.stop().animate({
left: defLeftW,
width: itemW
},300)
})
})();

});