效果展示

自定义CSS

/*九宫格适配*/
.lists-imgs:not(.count-1)>span {
    flex: 0 0 calc(100% / 3 - 4px);
    padding-bottom: calc(100% / 3 / 1 - 4px);
    margin: 2px;
    position: relative;
}
.lists-imgs:not(.count-1) {
    display: flex;
    flex-wrap: wrap;
    --img-count: 9;
    width: 70%;
}

PHP代码修改

打开/inc/functions/bbs/inc/posts.php文件搜索$imgs_max = 4; 把他改成$imgs_max = 9;