p标签超出指定行数变省略号

p标签超出指定行数变省略号：

p:nth-child(2) {
        overflow: hidden;
        text-overflow: ellipsis;
        display: -webkit-box;
        -webkit-box-orient: vertical;
        -webkit-line-clamp: 2;
        word-wrap: break-word;
        word-break: break-all;
      }