scss Mixin在SASS中添加三角形

Posted 2021-05-17

/*
* @include triangle within a pseudo element and add positioning properties (ie. top, left)
* $direction: up, down, left, right
*/

@mixin triangle($direction, $size: 6px, $color: #222) {
  content: "";
  display: block;
  position: absolute;
  height: 0;
  width: 0;
  @if ($direction== "up") {
    border-bottom: $size solid $color;
    border-left: 1/2 * $size solid transparent;
    border-right: 1/2 * $size solid transparent;
  } @else if ($direction== "down") {
    border-top: $size solid $color;
    border-left: 1/2 * $size solid transparent;
    border-right: 1/2 * $size solid transparent;
  } @else if ($direction== "left") {
    border-top: 1/2 * $size solid transparent;
    border-bottom: 1/2 * $size solid transparent;
    border-right: $size solid $color;
  } @else if ($direction== "right") {
    border-top: 1/2 * $size solid transparent;
    border-bottom: 1/2 * $size solid transparent;
    border-left: $size solid $color;
  }
}