DatePicker: dynamic picker-options, close #2013 (#2051)

packages/date-picker/src/picker.vue

@@ -408,6 +408,7 @@ export default {
           this.picker.format = this.format;
         }
 
+        const updateOptions = () => {
           const options = this.pickerOptions;
 
           if (options && options.selectableRange) {
@@ -432,6 +433,9 @@ export default {
               this.picker[option] = options[option];
             }
           }
+        };
+        updateOptions();
+        this.$watch('pickerOptions', () => updateOptions(), { deep: true });
 
         this.$el.appendChild(this.picker.$el);
         this.pickerVisible = this.picker.visible = true;