//超过 @line 行显示 点点点
.overflow-ellipsis(@line) when(@line = 1) {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.overflow-ellipsis(@line) when(@line > 1) {
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: @line;
    -webkit-box-orient: vertical;
}