长夜漫漫，无心睡眠，研究了一下Jquery操作Cookie的方法，这里直接将成品贴出来，不做分析，下面有使用方法介绍。

jQuery.cookie=function(name,value,options){ 
    if(typeof value!='undefined'){ 
        options=options||{}; 
        if(value===null){ 
            value=''; 
            options.expires=-1; 
        } 
        var expires=''; 
        if(options.expires&&(typeof options.expires=='number'||options.expires.toUTCString)){ 
             var date; 
            if(typeof options.expires=='number'){ 
                date=new Date(); 
                date.setTime(date.getTime()+(options.expires * 24 * 60 * 60 * 1000)); 
             }else{  
                date=options.expires; 
            } 
            expires=';expires='+date.toUTCString(); 
         } 
        var path=options.path?';path='+options.path:''; 
        var domain=options.domain?';domain='+options.domain:''; 
        var secure=options.secure?';secure':''; 
        document.cookie=[name,'=',encodeURIComponent(value),expires,path,domain,secure].join(''); 
     }else{ 
        var cookieValue=null; 
        if(document.cookie&&document.cookie!=''){ 
            var cookies=document.cookie.split(';'); 
            for(var i=0;i<cookies.length;i++){ 
                var cookie=jQuery.trim(cookies[i]); 
                if(cookie.substring(0,name.length+1)==(name+'=')){ 
                    cookieValue=decodeURIComponent(cookie.substring(name.length+1)); 
                    break; 
                } 
            } 
        } 
        return cookieValue; 
    } 
}; 

具体使用方法示例：

$.cookie('username'); //获得cookie  
$.cookie('username', '张三'); //设置cookie  
$.cookie('username', '李四', { expires: 3 }); //设置带时间的cookie 3天  
$.cookie('username', '', { expires: -1 }); //删除cookie 
$.cookie('username', null); //删除 cookie