Update index.md

Author: a362758199

programming/javascript/user-guide/index.md

@@ -154,6 +154,14 @@ The complete code of the "Hello World" example is shown below
   </a>
 </p>
 
+> Don't want to deal with too many details? We also have an **out-of-the-box** version:
+> 
+> [Easy Barcode Scanner >>](https://github.com/Dynamsoft/easy-barcode-scanner) available for your reference.
+> ```js
+> // Scan instantly with a single function!
+> let txt = await EasyBarcodeScanner.scan();
+> ```
+
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 #### About the code