layui的时间线当点击按钮的时候自动添加一条新时间线

 1   $('.littleTaskBtn li').on('click',function(){
 2             var content=$('.content').html();
 3             $('.layui-timeline-item').css('display','block');
 4             $('#layui-timeline').append(content);
 5             var lists = $('.layui-timeline-item');
 6             for (var j = 0; j < lists.length; j++) {
 7                 lists.eq(j).j = j;
 8                 var list = lists.eq(j).prevAll().length;
 9                 $('.layui-timeline-item').eq(j).find('span:eq(0)').text(list + 1);
10             }
11         })