less-伪元素

利用&添加伪元素

编辑less：

.clearfix {
  display: block;
  zoom: 1;

  &:after {
    content: " ";
    display: block;
    font-size: 0;
    height: 0;
    clear: both;
    visibility: hidden;
  }
}

输出css：

.clearfix {
  display: block;
  zoom: 1;
}
.clearfix:after {
  content: " ";
  display: block;
  font-size: 0;
  height: 0;
  clear: both;
  visibility: hidden;
}