feat(input-number): support keyboard events ArrowUp and ArrowDown opera… (#161)

* feat: InputNumber support keyboard events ArrowUp and ArrowDown operations

* feat: Optimize code

CHANGELOG.en-US.md

@@ -5,6 +5,7 @@
 ## Feats
 
 - `n-tree` support `disabled` & `checkboxDisabled` on option.
+- `n-input-number` support keyboard events ArrowUp and ArrowDown operations.
 
 ## Fixes
 

CHANGELOG.zh-CN.md

@@ -5,6 +5,7 @@
 ## Feats
 
 - `n-tree` 选项支持 `disabled` & `checkboxDisabled` 属性
+- `n-input-number` 支持键盘的上键和下键操作
 
 ## Fixes
 

src/input-number/src/InputNumber.tsx

@@ -293,6 +293,16 @@ export default defineComponent({
         if (value !== false) {
           inputInstRef.value?.deactivate()
         }
+      } else if (e.code === 'ArrowUp') {
+        const value = deriveValueFromDisplayedValue()
+        if (value !== false) {
+          doAdd()
+        }
+      } else if (e.code === 'ArrowDown') {
+        const value = deriveValueFromDisplayedValue()
+        if (value !== false) {
+          doMinus()
+        }
       }
     }
     function handleUpdateDisplayedValue (value: string): void {