message: chore(CouponCell): improve bem
diff: @@ -39,9 +39,7 @@ function CouponCell(
  slots: DefaultSlots,
  ctx: RenderContext<CouponCellProps>
  ) {
  - const valueClass = props.coupons[+props.chosenCoupon]
  - ? 'van-coupon-cell--selected'
  - : '';
  + const valueClass = props.coupons[+props.chosenCoupon] ? bem('selected') : '';
  const value = formatValue(props);
  return (
  