fix bug

models/data_manage/edb_info_calculate_ljzzy.go

@@ -110,7 +110,10 @@ func RefreshCalculateLjzzy(edbInfoId int, fromEdbInfo *EdbInfo, edbCode, startDa
 				dataPreItem := yv[i-1]
 				if dataCurrentItem != nil && dataPreItem != nil {
 					date = dataCurrentItem.DataTime
-					val, _ = decimal.NewFromFloat(dataCurrentItem.Value).Sub(decimal.NewFromFloat(dataPreItem.Value)).Float64()
+					//val, _ = decimal.NewFromFloat(dataCurrentItem.Value).Sub(decimal.NewFromFloat(dataPreItem.Value)).Float64()
+					a := decimal.NewFromFloat(dataCurrentItem.Value)
+					b := decimal.NewFromFloat(dataPreItem.Value)
+					val, _ = a.Sub(b).Float64()
 				}
 			}
 			if date != "" {