显示一行，省略号
.content { white-space: nowrap; text-overflow: ellipsis; overflow: hidden; word-break: break-all; }
显示两行，省略号
.content { text-overflow: -o-ellipsis-lastline; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-line-clamp: 2; line-clamp: 2; -webkit-box-orient: vertical; }
