refactor: optimized code

src/calendar/table-date.vue

@@ -63,7 +63,7 @@
 import { getWeek, format } from 'date-format-parse';
 import IconButton from './icon-button';
 import { chunk } from '../util/base';
-import { createDate, getCalendar } from '../util/date';
+import { getCalendar, setMonth, setYear } from '../util/date';
 import { getLocale } from '../locale';
 
 export default {
@@ -141,22 +141,33 @@ export default {
     },
   },
   methods: {
-    getNextCalendar(diffMonth) {
-      const year = this.calendar.getFullYear();
-      const month = this.calendar.getMonth();
-      return createDate(year, month + diffMonth);
-    },
     handleIconLeftClick() {
-      this.$emit('changecalendar', this.getNextCalendar(-1), 'last-month');
+      this.$emit(
+        'changecalendar',
+        setMonth(this.calendar, v => v - 1),
+        'last-month'
+      );
     },
     handleIconRightClick() {
-      this.$emit('changecalendar', this.getNextCalendar(1), 'next-month');
+      this.$emit(
+        'changecalendar',
+        setMonth(this.calendar, v => v + 1),
+        'next-month'
+      );
     },
     handleIconDoubleLeftClick() {
-      this.$emit('changecalendar', this.getNextCalendar(-12), 'last-year');
+      this.$emit(
+        'changecalendar',
+        setYear(this.calendar, v => v - 1),
+        'last-year'
+      );
     },
     handleIconDoubleRightClick() {
-      this.$emit('changecalendar', this.getNextCalendar(12), 'next-year');
+      this.$emit(
+        'changecalendar',
+        setYear(this.calendar, v => v + 1),
+        'next-year'
+      );
     },
     handlePanelChange(panel) {
       this.$emit('changepanel', panel);

src/calendar/table-month.vue

@@ -35,7 +35,7 @@
 import { chunk } from '../util/base';
 import IconButton from './icon-button';
 import { getLocale } from '../locale';
-import { createDate } from '../util/date';
+import { setYear } from '../util/date';
 
 export default {
   name: 'TableMonth',
@@ -72,16 +72,19 @@ export default {
     },
   },
   methods: {
-    getNextCalendar(diffYear) {
-      const year = this.calendar.getFullYear();
-      const month = this.calendar.getMonth();
-      return createDate(year + diffYear, month);
-    },
     handleIconDoubleLeftClick() {
-      this.$emit('changecalendar', this.getNextCalendar(-1), 'last-year');
+      this.$emit(
+        'changecalendar',
+        setYear(this.calendar, v => v - 1),
+        'last-year'
+      );
     },
     handleIconDoubleRightClick() {
-      this.$emit('changecalendar', this.getNextCalendar(1), 'next-year');
+      this.$emit(
+        'changecalendar',
+        setYear(this.calendar, v => v + 1),
+        'next-year'
+      );
     },
     handlePanelChange() {
       this.$emit('changepanel', 'year');

src/calendar/table-year.vue

@@ -30,7 +30,7 @@
 <script>
 import IconButton from './icon-button';
 import { chunk } from '../util/base';
-import { createDate } from '../util/date';
+import { setYear } from '../util/date';
 
 export default {
   name: 'TableYear',
@@ -78,16 +78,19 @@ export default {
       }
       return chunk(years, 2);
     },
-    getNextCalendar(diffYear) {
-      const year = this.calendar.getFullYear();
-      const month = this.calendar.getMonth();
-      return createDate(year + diffYear, month);
-    },
     handleIconDoubleLeftClick() {
-      this.$emit('changecalendar', this.getNextCalendar(-10), 'last-decade');
+      this.$emit(
+        'changecalendar',
+        setYear(this.calendar, v => v - 10),
+        'last-decade'
+      );
     },
     handleIconDoubleRightClick() {
-      this.$emit('changecalendar', this.getNextCalendar(10), 'next-decade');
+      this.$emit(
+        'changecalendar',
+        setYear(this.calendar, v => v + 10),
+        'next-decade'
+      );
     },
     handleClick(evt) {
       let { target } = evt;

src/date-picker.js

@@ -284,20 +284,16 @@ export default {
           return this.formatDate(date, this.valueType);
       }
     },
-    emitValue(date, type) {
+    emitValue(date, type, close = true) {
       // fix IE11/10 trigger input event when input is focused. (placeholder !== '')
       this.userInput = null;
       const value = Array.isArray(date) ? date.map(this.date2value) : this.date2value(date);
       this.$emit('input', value);
       this.$emit('change', value, type);
-      this.afterEmitValue(type);
-      return value;
-    },
-    afterEmitValue(type) {
-      // this.type === 'datetime', click the time should close popup
-      if (!type || type === this.type || type === 'time') {
+      if (close) {
         this.closePopup();
       }
+      return value;
     },
     isValidValue(value) {
       if (this.validMultipleType) {
@@ -336,7 +332,12 @@ export default {
       if (this.confirm) {
         this.currentValue = val;
       } else {
-        this.emitValue(val, this.validMultipleType ? `multiple-${type}` : type);
+        this.emitValue(
+          val,
+          type,
+          // this.type === 'datetime', click the time should close popup
+          !this.validMultipleType && (type === this.type || type === 'time')
+        );
       }
     },
     clear() {

src/util/date.js

@@ -77,7 +77,7 @@ export function getCalendar({ firstDayOfWeek, year, month }) {
 
 export function setMonth(dirtyDate, dirtyMonth) {
   const date = new Date(dirtyDate);
-  const month = Number(dirtyMonth);
+  const month = typeof dirtyMonth === 'function' ? dirtyMonth(date.getMonth()) : Number(dirtyMonth);
   const year = date.getFullYear();
   const daysInMonth = createDate(year, month + 1, 0).getDate();
   const day = date.getDate();
@@ -85,6 +85,13 @@ export function setMonth(dirtyDate, dirtyMonth) {
   return date;
 }
 
+export function setYear(dirtyDate, dirtyYear) {
+  const date = new Date(dirtyDate);
+  const year = typeof dirtyYear === 'function' ? dirtyYear(date.getFullYear()) : dirtyYear;
+  date.setFullYear(year);
+  return date;
+}
+
 export function assignTime(target, source) {
   const date = new Date(target);
   const time = new Date(source);