message: [bug fix]: fix tab component when has a lot of text, show ellipsis
diff: @import './common/var.css';
  +@import './mixins/ellipsis.css';
  .van-tabs {
  position: relative;
  cursor: pointer;
  text-align: center;
  flex: 1;
  + @mixin multi-ellipsis 1;
  &--active {
  color: $red;
  