ReferenceError:未定义SockJS，无法将模块导入Angular

ReferenceError: SockJS is not defined, cannot import module in Angular.

This error occurs when the SockJS module is not defined or not imported properly in an Angular application. SockJS is a JavaScript library that provides a WebSocket-like object for browsers that do not support native WebSocket.

To resolve this issue, you can follow these steps:

1. Install SockJS library:
   • Run the following command in your Angular project directory to install SockJS library:npm install sockjs-client
2. Import SockJS in your Angular component:
   • Open the component file where you want to use SockJS.
   • Add the following import statement at the top of the file:import * as SockJS from 'sockjs-client';
3. Use SockJS in your Angular component:
   • You can now use the SockJS object in your component to establish a WebSocket connection or perform other operations.

Example usage:

import { Component, OnInit } from '@angular/core';
import * as SockJS from 'sockjs-client';

@Component({
  selector: 'app-my-component',
  templateUrl: './my-component.component.html',
  styleUrls: ['./my-component.component.css']
})
export class MyComponent implements OnInit {
  private sock: any;

  ngOnInit() {
    this.sock = new SockJS('http://example.com/ws'); // Replace with your WebSocket server URL
    // Perform WebSocket operations using this.sock
  }
}

Please note that the above steps assume you have already set up an Angular project and have a WebSocket server running. Adjust the WebSocket server URL according to your setup.

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Remember to import the SockJS library and use it correctly in your Angular application to avoid the ReferenceError.