Fixed links

Author: kxjc

programming/javascript/user-guide/index.md

@@ -90,7 +90,7 @@ Let's start with the "Hello World" example of the DBR-JS SDK which demonstrates
 
 **Basic Requirements**
   - Internet connection
-  - A supported browser
+  - [A supported browser](#system-requirements)
   - Camera access
 
 ### Understand the code
@@ -166,7 +166,7 @@ The complete code of the "Hello World" example is shown below
 
 #### About the code
 
-- `Dynamsoft.License.LicenseManager.initLicense()`: This method initializes the license for using the SDK in the application. Note that the string "**DLS2eyJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSJ9**" used in this example points to an online license that requires a network connection to work. Read more on [Specify the license](#specify-the-license).
+- `Dynamsoft.License.LicenseManager.initLicense()`: This method initializes the license for using the SDK in the application. Note that the string "**DLS2eyJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSJ9**" used in this example points to an online license that requires a network connection to work. Read more on [Specify the license](#1-specify-the-license).
 
 - `Dynamsoft.Core.CoreModule.loadWasm(["dbr"])`: This is an optional code. Used to load wasm resources in advance, reducing latency between video playing and barcode decoding.
 
@@ -183,11 +183,11 @@ The complete code of the "Hello World" example is shown below
       cvRouter.startCapturing("ReadSingleBarcode");
       ```
   - **Dispatch Results to Listening Objects**
-    - The processing results are returned through the [CapturedResultReceiver](https://www.dynamsoft.com/capture-vision/docs/core/architecture/output.html#captured-result-receiver?lang=js) interface. The `CapturedResultReceiver` object is registered to `cvRouter` via the method `addResultReceiver()`. For more information, please check out [Register a result receiver](#register-a-result-receiver).
+    - The processing results are returned through the [CapturedResultReceiver](https://www.dynamsoft.com/capture-vision/docs/core/architecture/output.html#captured-result-receiver?lang=js) interface. The `CapturedResultReceiver` object is registered to `cvRouter` via the method `addResultReceiver()`. For more information, please check out [Register a result receiver](#step-4-register-a-result-receiver).
       ```js
       cvRouter.addResultReceiver({/*The-CapturedResultReceiver-Object"*/});
       ```
-    - Also note that reading from video is extremely fast and there could be many duplicate results. We can use a [filter](#filter-the-results-important) with result deduplication enabled to filter out the duplicate results. The object is registered to `cvRouter` via the method `addResultFilter()`.
+    - Also note that reading from video is extremely fast and there could be many duplicate results. We can use a [filter](#3-important-filter-the-results) with result deduplication enabled to filter out the duplicate results. The object is registered to `cvRouter` via the method `addResultFilter()`.
       ```js
       cvRouter.addResultFilter(filter);
       ```
@@ -248,7 +248,7 @@ The simplest way to include the SDK is to use either the [jsDelivr](https://jsde
   yarn add [email protected] -E
   ```
 
-  NOTE that in frameworks, you need to [specify the engineResourcePaths](#specify-the-location-of-the-engine-files-optional).
+  NOTE that in frameworks, you need to [specify the engineResourcePaths](#2-optional-specify-the-location-of-the-engine-files).
 
 #### Option 2: Host the SDK yourself (optional)