折扣 DiscountCell, 处理 Range<String.Index>(str.startIndex.advancedBy(1) ..< str.endIndex.advancedBy(-1))
折扣 DiscountCell, 处理 Range<String.Index>(str.startIndex.advancedBy(1) ..< str.endIndex.advancedBy(-1))

zane001/ZMTuan,zane001/ZMTuan