docs: improve use-raf document (#12224)

packages/vant/docs/markdown/use-raf.en-US.md

@@ -6,9 +6,9 @@ Provide convenient call and cancellation of [requestAnimationFrame](https://deve
 
 ## Usage
 
-### Basic Usage
+### Single Call
 
-### Single call
+By using the `useRaf` method, you can execute a function before the next browser repaint.
 
 ```js
 import { useRaf } from '@vant/use';
@@ -16,35 +16,34 @@ import { useRaf } from '@vant/use';
 export default {
   setup() {
     let count = 0;
-    // A single call will be automatically canceledRaf after the callback is executed.
     useRaf(() => {
-      count++;
-      console.log(count); // It will only be executed once.
+      console.log(++count); // It will only be executed once.
     });
   },
 };
 ```
 
-### Unlimited calls
+### Loop Calls
+
+By using the `isLoop` option, you can execution of a function repeatedly at a specified interval until it is canceled.
 
 ```js
 import { useRaf } from '@vant/use';
 
 export default {
   setup() {
-    // isLoop Turn on the cycle
     let count = 0;
     const cancelRaf = useRaf(
       () => {
-        count++;
-        console.log(count); // Unlimited execution until it is cancelled.
+        console.log(++count); // Execute infinitely until canceled
+
         if (count === 5) {
           cancelRaf();
         }
       },
       {
-        interval: 0, // control interval to call this function
-        isLoop: true,
+        isLoop: true, // Enable the loop
+        interval: 100, // Set call interval
       },
     );
   },
@@ -62,12 +61,12 @@ function useRaf(
     interval?: number;
     isLoop?: boolean;
   },
-) {}
+): void;
 ```
 
 ### Params
 
 | Name | Description | Type | Default |
 | --- | --- | --- | --- |
-| callback | Callback | _() => void_ | _() => void_ |
+| callback | Callback | _() => void_ | - |
 | options | Options | _{ interval?: number; isLoop?: boolean }_ | _{ interval: 0; isLoop: false }_ |

packages/vant/docs/markdown/use-raf.zh-CN.md

@@ -6,20 +6,18 @@
 
 ## 代码演示
 
-### 基本用法
-
 ### 单次调用
 
+通过 `useRaf` 方法，可以在下一次浏览器重新绘制之前调用指定的函数。
+
 ```js
 import { useRaf } from '@vant/use';
 
 export default {
   setup() {
     let count = 0;
-    // 单次调用在回调执行完后会被自动 cancelRaf
     useRaf(() => {
-      count++;
-      console.log(count); // 只会执行 1 次
+      console.log(++count); // 只会执行 1 次
     });
   },
 };
@@ -27,24 +25,25 @@ export default {
 
 ### 循环调用
 
+通过开启 `isLoop` 选项，你可以按指定的间隔重复执行某个函数，直到被取消。
+
 ```js
 import { useRaf } from '@vant/use';
 
 export default {
   setup() {
-    // isLoop 开启循环
     let count = 0;
     const cancelRaf = useRaf(
       () => {
-        count++;
-        console.log(count); // 无限的执行，直到被 cancel
+        console.log(++count); // 无限执行，直到被 cancel
+
         if (count === 5) {
           cancelRaf();
         }
       },
       {
-        interval: 0, // 控制间隔多久去调用
-        isLoop: true,
+        isLoop: true, // 开启循环
+        interval: 100, // 设置调用间隔
       },
     );
   },
@@ -62,12 +61,12 @@ function useRaf(
     interval?: number;
     isLoop?: boolean;
   },
-) {}
+): void;
 ```
 
 ### 参数
 
 | 参数 | 说明 | 类型 | 默认 |
 | --- | --- | --- | --- |
-| callback | 回调函数 | _() => void_ | _() => void_ |
+| callback | 回调函数 | _() => void_ | - |
 | options | 配置参数 | _{ interval?: number; isLoop?: boolean }_ | _{ interval: 0; isLoop: false }_ |