docs(dropdown): 下拉菜单组件增加针对图标使用的用例

src/dropdown/demos/enUS/icon.demo.md

@@ -0,0 +1,49 @@
+# Icon
+
+```html
+<n-dropdown :options="options">
+  <n-button>User profile</n-button>
+</n-dropdown>
+```
+
+```js
+import { h, defineComponent } from 'vue'
+import { NIcon } from 'naive-ui'
+import {
+  PersonCircleOutline as UserIcon,
+  Pencil as EditIcon,
+  LogOutOutline as LogoutIcon
+} from '@vicons/ionicons5'
+
+const renderIcon = (icon) => {
+  return () => {
+    return h(NIcon, null, {
+      default: () => h(icon)
+    })
+  }
+}
+
+export default defineComponent({
+  setup () {
+    return {
+      options: [
+        {
+          label: 'Profile',
+          key: 'profile',
+          icon: renderIcon(UserIcon)
+        },
+        {
+          label: 'Edit Profile',
+          key: 'editProfile',
+          icon: renderIcon(EditIcon)
+        },
+        {
+          label: 'Logout',
+          key: 'logout',
+          icon: renderIcon(LogoutIcon)
+        }
+      ]
+    }
+  }
+})
+```

src/dropdown/demos/enUS/index.demo-entry.md

@@ -6,6 +6,7 @@ When you have some functions to trigger.
 
 ```demo
 basic
+icon
 trigger
 cascade
 arrow

src/dropdown/demos/zhCN/icon.demo.md

@@ -0,0 +1,49 @@
+# 图标
+
+```html
+<n-dropdown :options="options">
+  <n-button>用户资料</n-button>
+</n-dropdown>
+```
+
+```js
+import { h, defineComponent } from 'vue'
+import { NIcon } from 'naive-ui'
+import {
+  PersonCircleOutline as UserIcon,
+  Pencil as EditIcon,
+  LogOutOutline as LogoutIcon
+} from '@vicons/ionicons5'
+
+const renderIcon = (icon) => {
+  return () => {
+    return h(NIcon, null, {
+      default: () => h(icon)
+    })
+  }
+}
+
+export default defineComponent({
+  setup () {
+    return {
+      options: [
+        {
+          label: '用户资料',
+          key: 'profile',
+          icon: renderIcon(UserIcon)
+        },
+        {
+          label: '编辑用户资料',
+          key: 'editProfile',
+          icon: renderIcon(EditIcon)
+        },
+        {
+          label: '退出登录',
+          key: 'logout',
+          icon: renderIcon(LogoutIcon)
+        }
+      ]
+    }
+  }
+})
+```

src/dropdown/demos/zhCN/index.demo-entry.md

@@ -6,6 +6,7 @@
 
 ```demo
 basic
+icon
 trigger
 cascade
 arrow