<ul id="catagory"> 
   <li><a href="#">星期一</a></li> 
   <li><a href="#">星期二</a></li> 
   <li><a href="#">星期三</a></li> 
   <li><a href="#">星期四</a></li> 
</ul>

$(document).ready(function() {  
    $("#catagory a").hover(function() {  
        $(this).animate({ paddingLeft: "20px" }, { queue: false, duration: 500 });  
    }, function() {  
        $(this).animate({ paddingLeft: "0" }, { queue: true, duration: 500 });  
    });  
});

(function ($) {  
    $.fn.extend({  
        //插件名稱(chēng) - paddingList  
        paddingList: function (options) {  
            //參數(shù)和默認(rèn)值  
            var defaults = {  
                animatePadding: 10,  
                hoverColor: "Black" 
            };  
            var options = $.extend(defaults, options);  
            return this.each(function () {  
                var o = options;  
                //將元素集合賦給變量 本例中是 ul對(duì)象   
                var obj = $(this);  
                //得到ul中的a對(duì)象  
                var items = $("li a", obj);  
 
                //添加hover()事件到a  
             items.hover(function () {  
                    $(this).css("color", o.hoverColor);  
                    //queue false表示不添加到動(dòng)畫(huà)隊(duì)列中  
                    $(this).animate({ paddingLeft: o.animatePadding }, { queue: false, duration: 300 });  
 
                }, function () {  
                    $(this).css("color", "");  
                    $(this).animate({ paddingLeft: "0" }, { queue: true, duration: 300 });  
                });  
 
            });  
        }  
    });  
})(jQuery);

$(document).ready(function() {  
    $("#catagory").paddingList({ animatePadding: 30, hoverColor: "Red" });  
});