refactor(calendar): 优化起止月份的计算时机

Author: shumuuu

packages/components/calendar/Calendar.tsx

@@ -195,18 +195,17 @@ const Calendar = forwardRef<CalendarMethods, CalendarProps>((props, ref) => {
         // 读取起止年份
         const beginYear = dayjs(rangeFromTo.from).year();
         const endYear = dayjs(rangeFromTo.to).year();
-        // 读取起止月份
-        const beginMon = parseInt(dayjs(rangeFromTo.from).format('M'), 10);
-        const endMon = parseInt(dayjs(rangeFromTo.to).format('M'), 10);
-
+        
         if (beginYear === endYear) {
           // 同一年内，禁用开始月份至结束月份之外的月份选项
           return monthIn < beginMon || monthIn > endMon;
         }
         if (yearIn === beginYear) {
+          const beginMon = parseInt(dayjs(rangeFromTo.from).format('M'), 10);
           return monthIn < beginMon;
         }
         if (yearIn === endYear) {
+          const endMon = parseInt(dayjs(rangeFromTo.to).format('M'), 10);
           return monthIn > endMon;
         }
       }