diff --git a/packages/client-sdk/README.md b/packages/client-sdk/README.md
index 07869fa84b..5223a16341 100644
--- a/packages/client-sdk/README.md
+++ b/packages/client-sdk/README.md
@@ -68,7 +68,7 @@ const cloud = new Cloud({
   baseUrl: "https://APPID.lafyun.com",
   // the database proxy entry, `app` is the policy name which response for the security of database access
   dbProxyUrl: "/proxy/app",
-  getAccessToken: () => localStorage.getItem("access_token"),
+  getAccessToken: () => wx.getStorageSync('access_token'),
   environment: "wxmp",
 });
 ```
diff --git a/packages/client-sdk/src/cloud.ts b/packages/client-sdk/src/cloud.ts
index 556d42ee0a..3dd9f772c9 100644
--- a/packages/client-sdk/src/cloud.ts
+++ b/packages/client-sdk/src/cloud.ts
@@ -1,50 +1,48 @@
-
-import { Db } from 'database-ql'
-import { Request } from './request/request'
-import { UniRequest } from './request/request-uni'
-import { WxmpRequest } from './request/request-wxmp'
-import { CloudOptions, EnvironmentType, RequestInterface } from './types'
-
+import { Db } from "database-ql";
+import { Request } from "./request/request";
+import { UniRequest } from "./request/request-uni";
+import { WxmpRequest } from "./request/request-wxmp";
+import { CloudOptions, EnvironmentType, RequestInterface } from "./types";
 
 /**
  * class Cloud provide the interface to request cloud function and cloud database.
  */
 class Cloud {
-  private config: CloudOptions
+  private config: CloudOptions;
 
   /**
    * request class by environment
    */
   private get requestClass() {
-    const env = this.config?.environment
-    let ret = Request
+    const env = this.config?.environment;
+    let ret = Request;
     if (this.config?.requestClass) {
-      ret = this.config?.requestClass
+      ret = this.config?.requestClass;
     } else if (env === EnvironmentType.UNI_APP) {
-      ret = UniRequest
+      ret = UniRequest;
     } else if (env === EnvironmentType.WX_MP) {
-      ret = WxmpRequest
+      ret = WxmpRequest;
     } else {
-      ret = Request
+      ret = Request;
     }
 
-    return ret
+    return ret;
   }
 
   /**
    * internal request class
    */
-  protected _request: RequestInterface
+  protected _request: RequestInterface;
 
   /**
    * Create a cloud instance
-   * @param config 
+   * @param config
    */
   constructor(config: CloudOptions) {
     const warningFunc = () => {
-      console.warn('WARNING: no getAccessToken set for db proxy request')
-      return ""
-    }
+      console.warn("WARNING: no getAccessToken set for db proxy request");
+      return "";
+    };
 
     this.config = {
       baseUrl: config.baseUrl,
@@ -54,53 +52,47 @@ class Cloud {
       primaryKey: config?.primaryKey,
       timeout: config?.timeout,
       headers: config?.headers,
-      requestClass: config?.requestClass
-    }
+      requestClass: config?.requestClass,
+    };
 
-    const reqClass = this.requestClass
-    this._request = new reqClass(this.config)
+    const reqClass = this.requestClass;
+    this._request = new reqClass(this.config);
   }
 
   /**
    * Get a cloud database instance
-   * @returns 
+   * @returns
    */
   database() {
     return new Db({
       request: this._request,
-      primaryKey: this.config?.primaryKey
-    })
+      primaryKey: this.config?.primaryKey,
+    });
   }
 
   /**
    * Invoke cloud function by name use POST http method
    * @alias alias of `invoke()` for history reason
-   * @param functionName 
-   * @param data 
-   * @returns 
+   * @param functionName
+   * @param data
+   * @returns
    */
-  async invokeFunction<T = any>(functionName: string, data: any): Promise<T> {
-    const url = this.config.baseUrl + `/${functionName}`
-    const res = await this
-      ._request
-      .request(url, data)
+  async invokeFunction<T = any>(functionName: string, data?: any): Promise<T> {
+    const url = this.config.baseUrl + `/${functionName}`;
+    const res = await this._request.request(url, data);
 
-    return res.data
+    return res.data;
   }
 
   /**
    * Invoke cloud function by name use POST http method
-   * @param functionName 
-   * @param data 
-   * @returns 
+   * @param functionName
+   * @param data
+   * @returns
    */
-  async invoke<T = any>(functionName: string, data: any): Promise<T> {
-    return await this.invokeFunction(functionName, data)
+  async invoke<T = any>(functionName: string, data?: any): Promise<T> {
+    return await this.invokeFunction(functionName, data);
   }
 }
 
-export {
-  Cloud,
-  Db,
-  Request
-}
+export { Cloud, Db, Request };