vue中img图片加载中以及加载失败显示默认图片问题

.sundry-img {
   position: relative;
   width: 180px;
   height: 120px;
   margin-right: 16px;
   &::after {
       content: "";
       position: absolute;
       z-index: 2;
       top: 0;
       left: 0;
       width: 180px;
       height: 120px;
       background: url("../../../../assets/images/defaultImg.png") no-repeat;
       background-size: 100% 100%;
       background-color: #fff;
     }
  }

https://www.cnblogs.com/fmixue/p/11929800.html