style: input style 优化

src/packages/__VUE/input/doc.md

@@ -9,12 +9,13 @@
 ``` javascript
 import { createApp } from 'vue';
 // vue
-import { Input } from '@nutui/nutui';
+import { Input,Icon } from '@nutui/nutui';
 // taro
-import { Input } from '@nutui/nutui-taro';
+import { Input,Icon } from '@nutui/nutui-taro';
 
 const app = createApp();
 app.use(Input);
+app.use(Icon);
 
 ```
 ## 代码演示

src/packages/__VUE/input/index.scss

@@ -12,6 +12,9 @@
     flex: 1;
     padding: 0 10px;
     padding-right: 35px;
+    outline: 0 none;
+    border: 0;
+    text-decoration: none;
   }
   &-label {
     width: 80px;