map切片把for改成截取

map.go

@@ -263,16 +263,17 @@ func MapSort(order, val, val_type string, MapDate []map[string]interface{}) ([]m
 	return res, nil
 }
 func MapPage(pageNum, pageSize int, MapDate []map[string]interface{}) []map[string]interface{} {
-	list := []map[string]interface{}{}
 	stat := (pageNum - 1) * pageSize
-	end := stat + pageSize - 1
-	for k, v := range MapDate {
-		if k >= stat && k <= end {
-			list = append(list, v)
-		}
-		if k > end {
-			break
-		}
+	end := stat + pageSize
+	count := len(MapDate)
+	if stat >= count {
+		return []map[string]interface{}{}
+	}
+	if end >= count {
+		end = count
+	}
+	if stat < 0 || end < 0 {
+		return []map[string]interface{}{}
 	}
-	return list
+	return MapDate[stat:end]
 }