uniapp自定义websocket类实现socket通信、心跳检测、检测连接、重连机制，仿vue-socket插件功能实现发送序列号进行连接检测，发送消息时42【key,value】格式，根据后端返回数据和需要接收到的数据做nsend与onSocketMessage的修改

import {publish,subscribe,unsubscribe
} from 'pubsub-js'
import {isArray
} from "@/utils/validate"const noop = function() {};
class Socket {//心跳检测定时器static stopTime = 0;//每25s发送报文给服务端监听连接是否正常static sendInterval = 0;//服务端监听连接异常时提示并进行socket重连static isCommunication = false;//连接中出错调用心跳检测方法的定时器static errorNr = '';//websocket已连接数static concatCount = 0;//连接后连接设备次数（用于拼接传输序号42后的数字）static sendTag = 0//pc端emit发送消息有回调函数时加入static isCallback = ["leave", "join"]//连接或断连publish相应isCallback数组内的值给客户端响应static sendKey = "";//new Socket时执行构造方法，对参数默认值进行初始化constructor({url = '',onOpen = noop,onMsg = noop,onClose = noop,onError = noop,onReload = noop,onRdFinsh = noop,maxInterValCount = 10,interValTime = 2000,...args} = {}) {this.isRconnectIng = false; //是否处于重连状态this.waiting = Promise.resolve(false); //心跳检查必须等待重连完成后this.waitDep = []; //等待时收集依赖的容器this.SocketTask = {nsend: noop,hbDetection: noop,nclose: noop,nrconnect: noop,isconnect: false,uniColse: false,maxInterValCount,interValTime,InterValCount: 0,eventPatch: null,url,onOpen,onMsg,onClose,onError,onReload,onRdFinsh,extra: args};//为对象提供连接方法this._EventDispath(this.SocketTask);//初始化websocketthis.initChat(this.SocketTask, this.SocketTask.extra);return this.SocketTask;}set CONCATCOUNT(value) {Socket.concatCount = value;if (value > 0) this._notify();}get CONCATCOUNT() {return Socket.concatCount}/*** 每25s给服务端发送一次数据,确保连接未断开*/initSendTime() {Socket.sendInterval = setInterval(() => {if (Socket.isCommunication) {uni.showToast({icon: 'none',title: '网络异常',duration: 2000})this.SocketTask.nrconnect()} else {Socket.isCommunication = truethis.SocketTask.nsend(2)}}, 25000)subscribe("number", function(msg, data) {Socket.isCommunication = false})}//销毁定时器destroySend() {clearTimeout(Socket.errorNr)clearTimeout(Socket.stopTime);clearInterval(Socket.sendInterval)unsubscribe("number")}/*** 仅供内部使用，通知所有收集到的依赖*/_notify() {for (let i = 0; i < this.waitDep.length; i++) {this.waitDep[i].call(this.SocketTask);}this.waitDep = [];}/*** 仅供内部使用，确认当前是否连接成功,收集依赖*/_chunkConnect(fn) {//没有连接时收集起来，当连接成功时开始发送命令等操作if (Socket.concatCount > 0) {fn();} else {this.waitDep.push(fn);}}/*** 仅供内部使用，事件注册*/_EventDispath({onReload} = {}) {let SocketTask = this.SocketTask;let events = {onOpen: [],onMsg: [],onClose: [],onError: [],onReload: [],onRdFinsh: [],}SocketTask.hbDetection = () => {this.hbDetection()}//适配后端websocket发送请求数据//vue-socket-io 传入的是数组，第一位为key值SocketTask.nsend = (key, value) => {let that = thisthis._chunkConnect(() => {let data = "42"//web端连接或断开连接的时候传入420 421if (Socket.isCallback.includes(key)) {//收集当前连接的命令key值，等待返回响应时传递给客户端处理逻辑Socket.sendKey = key//421 422 ··· 依次递增data += Socket.sendTagSocket.sendTag++}if (value) {data += JSON.stringify([key, value])} else {//特殊情况，当想要发送的请求不为42【key,value】格式时，key为客户端代码发送传入的值data = key + ""}uni.sendSocketMessage({//pc端emit事件有发送完毕回调函数时后端会需要有多一位数字的判断，并且返回时也会产生eg：420 -》 430// 没有回调函数时发送和接收命令前面都是42data: data,complete(e) {},})})}SocketTask.nclose = t => {this.destroySend()this._chunkConnect(() => {SocketTask.uniColse = true;uni.closeSocket();})}SocketTask.nrconnect = t => {this._chunkConnect(() => {this.waiting = new Promise(async (resolve) => {uni.closeSocket();let reloadStatus = false;try {const res = await this.initChat(SocketTask, SocketTask.extra);reloadStatus = res;} catch (e) {}onReload.call(SocketTask, reloadStatus, SocketTask);SocketTask.eventPatch.dispatchEvent('onReload', reloadStatus);resolve(reloadStatus);})})}function EventDispatcher() {this.events = events;}for (let key in events) {//绑定监听方法到EventDispatcher方法原型中EventDispatcher.prototype[key] = function(handler) {if (typeof handler != 'function') return;this.events[key].push(handler)}}//调用监听方法 监听连接状态EventDispatcher.prototype.dispatchEvent = function(type, msg) {let evenArr = this.events[type];if (evenArr.length > 0) {for (let i = 0; i < evenArr.length; i++) {evenArr[i].call(SocketTask, msg, SocketTask);}}}SocketTask.eventPatch = new EventDispatcher();}/*** 心跳检测*/async hbDetection() {const SocketTask = this.SocketTask;if (SocketTask.uniColse) {return false;}clearTimeout(Socket.stopTime);if (!SocketTask.isconnect) { //未连接则启动连接if (SocketTask.maxInterValCount > SocketTask.InterValCount) {Socket.stopTime = setTimeout(async () => {try {const R_result = await this.waiting;if (R_result) return;this.isRconnectIng = true;const openResult = await this.initChat(SocketTask, SocketTask.extra);if (openResult) {SocketTask.InterValCount++;return;}return this.hbDetection();} catch (e) {return this.hbDetection();}}, SocketTask.interValTime)} else {SocketTask.onRdFinsh.call(SocketTask, SocketTask.maxInterValCount, SocketTask);SocketTask.eventPatch.dispatchEvent('onRdFinsh', SocketTask.maxInterValCount);}}}/*** websocket监听事件*/SocketEvents({onOpen,onMsg,onClose,onError,onReload,} = {}) {return new Promise((resolve, reject) => {const SocketTask = this.SocketTask;uni.onSocketOpen(res => {this.CONCATCOUNT += 1;this.isRconnectIng = false;SocketTask.isconnect = true;Socket.sendTag = 0Socket.sendKey = ""SocketTask.InterValCount = 0;SocketTask.uniColse = false;resolve(true);this.initSendTime()onOpen.call(SocketTask, res, SocketTask);SocketTask.eventPatch.dispatchEvent('onOpen', res)})//适配服务器端返回的消息格式uni.onSocketMessage(msg => {let serialNumber = 0let arrayIndex = msg.data.indexOf("[")let objIndex = msg.data.indexOf("{")//判断返回值是纯数字或json格式let dataStart = arrayIndex != -1 && objIndex != -1 ?(arrayIndex < objIndex ? arrayIndex : objIndex) :(arrayIndex == -1 ? objIndex : arrayIndex)if (dataStart == -1) {serialNumber = msg.data.substring(0)publish("number", serialNumber)} else {serialNumber = msg.data.substring(0, dataStart)let jsonData = JSON.parse(msg.data.substring(dataStart))//判断是否为连接事件if (serialNumber == `43${Socket.sendTag - 1}`) {publish(Socket.sendKey, jsonData[0])} else if (isArray(jsonData)) {publish(jsonData[0], jsonData[1])}}onMsg.call(SocketTask, msg, SocketTask);SocketTask.eventPatch.dispatchEvent('onMsg', msg)})uni.onSocketClose(async err => {this.destroySend()SocketTask.isconnect = false;SocketTask.InterValCount = 0;//微信小程序 连接失败会自动关闭连接，返回false给心跳监测方法resolve(false);if (!this.isRconnectIng) {this.hbDetection();}onClose.call(SocketTask, err, SocketTask);SocketTask.eventPatch.dispatchEvent('onClose', err);})uni.onSocketError(err => {this.destroySend()Socket.errorNr = setTimeout(() => {this.hbDetection()}, 3000)onError.call(SocketTask, err, SocketTask);SocketTask.eventPatch.dispatchEvent('onError', err)})})}/*** 开始初始化chat*/initChat({url,onOpen,onMsg,onClose,onError,onReload} = {}, args) {return new Promise(async (resolve, reject) => {try {await this.connectSocket(url, args);let res = await this.SocketEvents({onOpen,onMsg,onClose,onError,onReload,})resolve(res);} catch (e) {console.log('initChat', e)reject();}})}/*** 连接webSocket*/connectSocket(url, args) {return new Promise((resolve, reject) => {uni.connectSocket({url,success: () => {resolve();},fail: err => {reject();},...args})})}
}
export default Socket