SOURCE

  var lbtIndex = 0;
           
                setInterval(function () {
                    lbtIndex++;
                    if (lbtIndex >= $("a").length)
                        lbtIndex = 0;
                    $("a").eq(lbtIndex)
                        .animate({ opacity: 1 }, 700, 'ease-out',function(){$(this).css("z-index",10)}).siblings()
                        .animate({ opacity: 0 }, 700, 'ease-out',function(){$(this).css("z-index",1)})
                }, 3000);

  <div>
<a href='http://testbtp.iuoooo.com/Mobile/CommodityDetail?commodityId=a11cbaf0-73c9-4d22-b6f8-1c41b88f5c06'  style='background-image:url(http://testfileserver.iuoooo.com/Jinher.JAP.BaseApp.FileServer.UI/FileManage/GetFile?fileURL=29e54e46-3e17-4ca4-8f03-db71fb8f9556/2018020911/e8bf7dba-1424-4fee-9249-07ecb4e6e6b1_153b4992-359c-46f5-8e81-1bdbb7cb5767.jpg&amp;e=0.0929092453719198)'  ></a>

 <a href='http://testbtp.iuoooo.com/Mobile/CommodityDetail?01ee3f0a-8975-4fa9-a8a2-2673b7e2d6a6'  style='background-image:url(http://testfileserver.iuoooo.com/Jinher.JAP.BaseApp.FileServer.UI/FileManage/GetFile?fileURL=29e54e46-3e17-4ca4-8f03-db71fb8f9556/2018020911/1df137b2-fcdb-4580-9133-dab5dd5f7063_5b0dd01d-6a50-43cc-961d-ce6321147e8e.jpg&amp;e=0.20965343908580047)'></a>
     
  <a href='http://testbtp.iuoooo.com/Mobile/CommodityDetail?commodityId=b805c62c-c489-4d9e-abd3-0e923004bbea' style='background-image:url(http://testfileserver.iuoooo.com/Jinher.JAP.BaseApp.FileServer.UI/FileManage/GetFile?fileURL=29e54e46-3e17-4ca4-8f03-db71fb8f9556/2018020910/3418da26-7ba7-451b-8408-448e1aa30f9a_4a13db40-3f76-4748-a5a4-3167a289495d.jpg&amp;e=0.0067817054070595795)'></a>
     
 <a href='http://testbtp.iuoooo.com/Mobile/CommodityDetail?commodityId=946da638-f4eb-445e-9951-1a97fdf012e7' style='background-image:url(http://testfileserver.iuoooo.com/Jinher.JAP.BaseApp.FileServer.UI/FileManage/GetFile?fileURL=29e54e46-3e17-4ca4-8f03-db71fb8f9556/2018020910/44e0f9ed-2a32-4fe4-a646-b7a8f30be25e_19fc26f1-c768-485c-ae80-5df8d802cac0.jpg&amp;e=0.45064177961054663)'></a>
      </div>

a{
  position:absolute;
  display:block;
  width:100%;
  height:100%;
  background-size: cover;
  background-size:100% 100%; 
}
div{
  width:100vw;
  height:50vw;
   position:relative;
}
*{
  padding:0;
  margin:0;
  
}