活动已结束，日期时间比较并弹框跳转

var now = new Date(),
　　end = new Date("2014/12/16 10:00");

     if(now > end){
        var html =  
                ‘<div id="mbox_overlay" class="mbox_overlay"></div>‘+
                ‘<div class="pop-box">‘+
                     ‘<p>很遗憾，活动已经结束啦</p>‘+
                     ‘<p class="J_end"></p>‘+
                ‘ </div>‘;
        var t=3;//设定跳转的时间 
        var refer = function(){ 
            if(t==0){ 
                 location="http://www.xxx.com"; //#设定跳转的链接地址 
             } 
             $(‘.J_end‘).html("" + t + "秒后为您跳转至首页"); // 显示倒计时 
             t--; 
       };
       setInterval(refer,1000);//启动1秒定时
       $(‘body‘).append(html);
 
}else{};