feat(Calendar): allow default-date to be null (#7116)

src/calendar/index.js

@@ -136,12 +136,13 @@ export default createComponent({
     buttonDisabled() {
       const { type, currentDate } = this;
 
-      if (type === 'range') {
-        return !currentDate[0] || !currentDate[1];
-      }
-
-      if (type === 'multiple') {
-        return !currentDate.length;
+      if (currentDate) {
+        if (type === 'range') {
+          return !currentDate[0] || !currentDate[1];
+        }
+        if (type === 'multiple') {
+          return !currentDate.length;
+        }
       }
 
       return !currentDate;
@@ -198,6 +199,11 @@ export default createComponent({
     scrollIntoView() {
       this.$nextTick(() => {
         const { currentDate } = this;
+
+        if (!currentDate) {
+          return;
+        }
+
         const targetDate =
           this.type === 'single' ? currentDate : currentDate[0];
         const displayed = this.value || !this.poppable;
@@ -222,6 +228,10 @@ export default createComponent({
     getInitialDate() {
       const { type, minDate, maxDate, defaultDate } = this;
 
+      if (defaultDate === null) {
+        return defaultDate;
+      }
+
       let defaultVal = new Date();
 
       if (compareDay(defaultVal, minDate) === -1) {
@@ -295,6 +305,11 @@ export default createComponent({
       const { type, currentDate } = this;
 
       if (type === 'range') {
+        if (!currentDate) {
+          this.select([date, null]);
+          return;
+        }
+
         const [startDay, endDay] = currentDate;
 
         if (startDay && !endDay) {
@@ -311,8 +326,12 @@ export default createComponent({
           this.select([date, null]);
         }
       } else if (type === 'multiple') {
-        let selectedIndex;
+        if (!currentDate) {
+          this.select([date]);
+          return;
+        }
 
+        let selectedIndex;
         const selected = this.currentDate.some((dateItem, index) => {
           const equal = compareDay(dateItem, date) === 0;
           if (equal) {