CSS使用sass语法

sass高阶用法

@mixin pubBgi($url, $width: 100%, $height: 100%) {
    width: $width;
    height: $height;
    background-image: url('https://www.jwblog.cn/images/user/#{$url}.png');
    background-repeat: no-repeat;
    background-size: 100% 100%;
}
.img-box {
    @include pubBgi('user', 200px, 200px);
}