<p>Lorem ipsum dolor sit, amet consectetur adipisicing elit. Sint ducimus ratione, velit accusantium eum labore. Excepturi doloribus magnam repudiandae? Rerum cum eos maiores architecto perspiciatis laborum, quidem eveniet labore eius.</p>

p {
  /* 关键代码 */
  display: -webkit-box;
  -webkit-box-orient: vertical;
  overflow: hidden;
  -webkit-line-clamp: 2;
  text-overflow: ellipsis; /*可选的属性*/
}