最优解决办法：样式穿透

sass和less的样式穿透：/deep/

 #father /deep/ .swiper-pagination-bullet-active {
    color:#fff;
    background: #ff51d6;
  }

stylus的样式穿透：>>>

 #father >>> .swiper-pagination-bullet-active {
    color:#fff;
    background: #ff51d6;
  }