docs: prettier all markdown files

src/dropdown-menu/README.md

@@ -30,15 +30,15 @@ export default {
       option1: [
         { text: 'Option1', value: 0 },
         { text: 'Option2', value: 1 },
-        { text: 'Option3', value: 2 }
+        { text: 'Option3', value: 2 },
       ],
       option2: [
         { text: 'Option A', value: 'a' },
         { text: 'Option B', value: 'b' },
         { text: 'Option C', value: 'c' },
-      ]
-    }
-  }
+      ],
+    };
+  },
 };
 ```
 
@@ -65,15 +65,15 @@ export default {
       option: [
         { text: 'Option1', value: 0 },
         { text: 'Option2', value: 1 },
-        { text: 'Option3', value: 2 }
-      ]
-    }
+        { text: 'Option3', value: 2 },
+      ],
+    };
   },
   methods: {
     onConfirm() {
       this.$refs.item.toggle();
-    }
-  }
+    },
+  },
 };
 ```
 
@@ -111,55 +111,55 @@ Use `active-color` prop to custom active color of the title and options
 ### DropdownMenu Props
 
 | Attribute | Description | Type | Default |
-|------|------|------|------|
-| active-color | Active color of title and option | *string* | `#1989fa` |
-| direction `v2.0.1` | Expand direction, can be set to `up` | *string* | `down` |
-| z-index | z-index of menu item | *number \| string* | `10` |
-| duration | Transition duration, unit second | *number \| string* | `0.2` |
-| overlay | Whether to show overlay | *boolean* | `true` |
-| close-on-click-overlay | Whether to close when click overlay | *boolean* | `true` |
-| close-on-click-outside `v2.0.7` | Whether to close when click outside | *boolean* | `true` |
+| --- | --- | --- | --- |
+| active-color | Active color of title and option | _string_ | `#1989fa` |
+| direction `v2.0.1` | Expand direction, can be set to `up` | _string_ | `down` |
+| z-index | z-index of menu item | _number \| string_ | `10` |
+| duration | Transition duration, unit second | _number \| string_ | `0.2` |
+| overlay | Whether to show overlay | _boolean_ | `true` |
+| close-on-click-overlay | Whether to close when click overlay | _boolean_ | `true` |
+| close-on-click-outside `v2.0.7` | Whether to close when click outside | _boolean_ | `true` |
 
 ### DropdownItem Props
 
 | Attribute | Description | Type | Default |
-|------|------|------|------|
-| value | Value of current option，can use `v-model` | *number \| string* | - |
-| title | Item title | *string* | Text of selected option |
-| options | Options | *Option[]* | `[]` |
-| disabled | Whether to disable dropdown item | *boolean* | `false` |
-| title-class | Title class | *string* | - |
-| get-container `v2.2.4` | Return the mount node for menu | *string \| () => Element* | - |
+| --- | --- | --- | --- |
+| value | Value of current option，can use `v-model` | _number \| string_ | - |
+| title | Item title | _string_ | Text of selected option |
+| options | Options | _Option[]_ | `[]` |
+| disabled | Whether to disable dropdown item | _boolean_ | `false` |
+| title-class | Title class | _string_ | - |
+| get-container `v2.2.4` | Return the mount node for menu | _string \| () => Element_ | - |
 
 ### DropdownItem Events
 
-| Event | Description | Arguments |
-|------|------|------|
-| change | Triggered select option and value changed | value |
-| open | Triggered when open menu | - |
-| close | Triggered when close menu | - |
-| opened | Triggered when menu opened | - |
-| closed | Triggered when menu closed | - |
+| Event  | Description                               | Arguments |
+| ------ | ----------------------------------------- | --------- |
+| change | Triggered select option and value changed | value     |
+| open   | Triggered when open menu                  | -         |
+| close  | Triggered when close menu                 | -         |
+| opened | Triggered when menu opened                | -         |
+| closed | Triggered when menu closed                | -         |
 
 ### DropdownItem Slots
 
-| Name | Description |
-|------|------|
-| default | Content |
-| title | Custom title |
+| Name    | Description  |
+| ------- | ------------ |
+| default | Content      |
+| title   | Custom title |
 
 ### DropdownItem Methods
 
 Use [ref](https://vuejs.org/v2/api/#ref) to get DropdownItem instance and call instance methods
 
-| Name | Description | Attribute | Return value |
-|------|------|------|------|
-| toggle | Toggle display | show: boolean | - |
+| Name   | Description    | Attribute     | Return value |
+| ------ | -------------- | ------------- | ------------ |
+| toggle | Toggle display | show: boolean | -            |
 
 ### Data Structure of Option
 
-| Key | Description | Type |
-|------|------|------|
-| text | Text | *string* |
-| value | Value | *number \| string* |
-| icon | Left icon | *string* |
+| Key   | Description | Type               |
+| ----- | ----------- | ------------------ |
+| text  | Text        | _string_           |
+| value | Value       | _number \| string_ |
+| icon  | Left icon   | _string_           |