Update README.md

README.md

@@ -89,6 +89,17 @@ npm i @nutui/nutui
 npm i @nutui/nutui-taro
 ```
 
+## 示例
+
+```js
+import { createApp } from "vue";
+import App from "./App.vue";
+// 注意：这种方式将会导入所有组件
+import NutUI from "@nutui/nutui";
+// 采用按需加载时  此全局css样式，需要删除
+import "@nutui/nutui/dist/style.css";
+createApp(App).use(NutUI).mount("#app");
+```
 
 ## 主题