Fix: Fixed the issue where the error prompt box on the Agent page would be covered #3221 (#8992)

### What problem does this PR solve?

Fix: Fixed the issue where the error prompt box on the Agent page would
be covered #3221

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/constants/agent.ts

@@ -8,17 +8,14 @@ export const CodeTemplateStrMap = {
     return f"result: {arg1 + arg2}"
 `,
   [ProgrammingLanguage.Javascript]: `const axios = require('axios');
-async function main(args) {
+async function main({}) {
   try {
     const response = await axios.get('https://github.com/infiniflow/ragflow');
-    console.log('Body:', response.data);
+    return 'Body:' + response.data;
   } catch (error) {
-    console.error('Error:', error.message);
+    return 'Error:' + error.message;
   }
-}
-
-module.exports = { main };
-`,
+}`,
 };
 
 export enum AgentGlobals {