feat(DropdownItem): title-class can be array or object type (#7926)

src/dropdown-item/index.js

@@ -21,7 +21,7 @@ export default createComponent({
     disabled: Boolean,
     teleport: [String, Object],
     modelValue: null,
-    titleClass: String,
+    titleClass: null,
     options: {
       type: Array,
       default: () => [],

src/dropdown-menu/README.md

@@ -158,7 +158,7 @@ Use `active-color` prop to custom active color of the title and options.
 | options | Options | _Option[]_ | `[]` |
 | disabled | Whether to disable dropdown item | _boolean_ | `false` |
 | lazy-render | Whether to lazy render util opened | _boolean_ | `true` |
-| title-class | Title class | _string_ | - |
+| title-class | Title class | _string \| string[] \| object_ | - |
 | teleport | Return the mount node for menu | _string \| Element_ | - |
 
 ### DropdownItem Events

src/dropdown-menu/README.zh-CN.md

@@ -166,7 +166,7 @@ export default {
 | options | 选项数组 | _Option[]_ | `[]` |
 | disabled | 是否禁用菜单 | _boolean_ | `false` |
 | lazy-render | 是否在首次展开时才渲染菜单内容 | _boolean_ | `true` |
-| title-class | 标题额外类名 | _string_ | - |
+| title-class | 标题额外类名 | _string \| string[] \| object_ | - |
 | teleport | 指定挂载的节点，[用法示例](#/zh-CN/popup#zhi-ding-gua-zai-wei-zhi) | _string \| Element_ | - |
 
 ### DropdownItem Events