So verwenden Sie Bootstrap-Sass

//Sass源码
$highlight-color: #000000;
.selected {
  border: 1px solid $highlight-color;
}
//编译后的CSS
.selected {
  border: 1px solid #000000; 
}

//Sass源码
@mixin border-radius($radius){
  -moz-border-radius:$radius;
  -webkit-border-radius:$radius;
  border-radius:$radius;
}

button{
  @include border-radius(5px);
}
//编译后的CSS
button {
  -moz-border-radius: 5px;
  -webkit-border-radius: 5px;
  border-radius: 5px; 
}

//Sass源码
.block{
  padding: 15px;
  margin-bottom: 15px;
}

.block-primary{
  @extend .block;
  color: #00aff0;
}
//编译后的CSS
.block, .block-primary {
  padding: 15px;
  margin-bottom: 15px; 
}

.block-primary {
  color: #00aff0; 
}

//Sass源码
@mixin add-background($color){
  background: $color;
  @if $color==#000000{
    color: #666666;
  }@else {
    color: #ffffff;
  }
}

.section-primary{
   @include add-background(#ffffff);
}
//编译后的CSS
.section-primary {
  background: #ffffff;
  color: #ffffff; 
}