scss 问题

V2EX = way to explore

V2EX 是一个关于分享和探索的地方

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This topic created in 2975 days ago, the information mentioned may be changed or developed.

在别人的代码里看到了如下片段，看不懂？这是什么？

@include b($block) {
  $B: 'fa-' + $block;

  @at-root .#{$B} {
    @content;
  }
}

@include e($element) {
  $E: $element;

  @at-root #{&}--#{$E} {
    @content;
  }
}

@include m($modifier) {
  $M: $modifier;

  @at-root #{&}__#{$M} {
    @content;
  }
}

@include when($state) {
  $S: 'is-' + $state;

  @at-root .#{$S} {
    @content;
  }
}

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scss modifier element block