https://www.cnblogs.com/zqzjs/archive/2017/02/10/6380318.html

    image.jpeg

    image.jpeg

    .price-monitoring-list-left img {
    display: block;
    position: relative;
    text-align: center;
    }

    .price-monitoring-list-left img:after {
    content: url(src/assets/img/default.png);
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #fff;
    }