手机做app的软件叫什么_北京资质代办公司排名_营业推广怎么写_如何做好网络推广工作

概要说明

signalr 是微软对 websocket技术的封装;

1. build() 与后端signalR服务建立链接；
2. 使用 on 方法监听后端定义的函数；ps：由后端发起，后端向前端发送数据
3. 使用 invoke 主动触发后端的函数；ps：由前端发起，前端向后端发送请求

安装依赖

pnpm install @microsoft/signalr --save

组件封装

import { HubConnection, HubConnectionBuilder } from "@microsoft/signalr";class SignalRService {private connection: HubConnection | null = null;private connectionStatus:| "disconnected"| "connecting"| "connected"| "error" = "disconnected";private serverUrl: string = ""; // 建立链接的服务器地址constructor(private url: string) {this.url = url;}public async start() {this.connectionStatus = "connecting";try {this.connection = new HubConnectionBuilder().withAutomaticReconnect()//断线自动重连.withUrl(this.serverUrl + `?fileId=${this.url}`).build();//启动连接await this.connection.start();this.connectionStatus = 'connected';console.log("SignalR server 连接成功");} catch (error) {console.error("SignalR server 连接失败:", error);this.connectionStatus = "error";throw error;}}//断开服务链接public async stop() {try {if (this.connection) {await this.connection.stop();this.connectionStatus = "disconnected";console.log("SignalR 断开连接");}} catch (error) {console.log(error);}}//重新链接public async reconnect() {if (this.connection) {await this.connection.stop();await this.connection.start();console.log("SignalR 重连中");}}//接收消息（接收后端发送给前端的数据）public async receiveMessage(callback: (message: string) => void, eventName: string) {if (this.connection) {this.connection.on(eventName, (message: string) => {callback(message);});}}//发送消息（由前端发送消息，后端接收数据）public async send(message: string) {if (this.connection && this.connectionStatus === "connected") {await this.connection.invoke("SendMessage", message);} else {throw new Error("Connection is not established");}}//获取当前状态public get status() {return this.connectionStatus;}public getConnection() {return this.connection;}
}export default SignalRService;

使用案例

// 使用示例
const signalRService = new SignalRService('链接地址');
signalRService.start().then(() => console.log('SignalR service started')).catch(error => console.error('Failed to start SignalR service:', error));// 在需要的时候发送消息
signalRService.send('Hello, SignalR!').then(() => console.log('Message sent')).catch(error => console.error('Failed to send message:', error));// 接收消息
signalRService.receiveMessage((message: string) => {console.log("Received message:", message);
}, "后端定义的方法名称（获取由后端给前端发送的数据）")// 停止连接
signalRService.stop();