fix(project): add polyfills and use ie11 compatible function (sumcumo#25

)

src/components/Datepicker.vue

@@ -125,6 +125,7 @@
   </div>
 </template>
 <script>
+import '~/utils/polyfills'
 import en from '~/locale/translations/en'
 import { makeDateUtils } from '~/utils/DateUtils'
 import DateInput from '~/components/DateInput'

src/locale/Language.js

@@ -55,12 +55,28 @@ export default class Language {
   }
 
   getMonthByAbbrName(name) {
-    const monthValue = this._monthsAbbr.findIndex((month) => month === name) + 1
+    let index = -1
+    this._monthsAbbr.some((month, i) => {
+      if (month === name) {
+        index = i
+        return true
+      }
+      return false
+    })
+    const monthValue = index + 1
     return monthValue < 10 ? `0${monthValue}` : `${monthValue}`
   }
 
   getMonthByName(name) {
-    const monthValue = this._months.findIndex((month) => month === name) + 1
+    let index = -1
+    this._months.some((month, i) => {
+      if (month === name) {
+        index = i
+        return true
+      }
+      return false
+    })
+    const monthValue = index + 1
     return monthValue < 10 ? `0${monthValue}` : `${monthValue}`
   }
 }

src/utils/polyfills.js

@@ -0,0 +1,2 @@
+import 'core-js/es/object/assign'
+import 'core-js/es/number/is-nan'