css 文本一行显示，超出省略号表示
white-space: nowrap;
text-overflow: ellipsis;
overflow: hidden;
word-break: break-all;
css 文本两行显示，超出省略号表示
text-overflow: -o-ellipsis-lastline;
overflow: hidden;
text-overflow: ellipsis;
display: -webkit-box;
-webkit-line-clamp: 2;
line-clamp: 2;
-webkit-box-orient: vertical;
