js封装一个websocket实现及使用详解

let Socket = ''
let setIntervalWesocketPush = null
/**
 * 建立websocket连接
 * @param {string} url ws地址
 */
export const createSocket = url => {
  Socket && Socket.close()
  if (!Socket) {
    console.log('建立websocket连接')
    Socket = new WebSocket(url)
    Socket.onopen = onopenWS
    Socket.onmessage = onmessageWS
    Socket.onerror = onerrorWS
    Socket.onclose = oncloseWS
  } else {
    console.log('websocket已连接')
  }
}
/**打开WS之后发送心跳 */
const onopenWS = () => {
  sendPing()
}
/**连接失败重连 */
const onerrorWS = () => {
  Socket.close()
  clearInterval(setIntervalWesocketPush)
  console.log('连接失败重连中')
  if (Socket.readyState !== 3) {
    Socket = null
    createSocket()
  }
}
/**WS数据接收统一处理 */
const onmessageWS = e => {
  window.dispatchEvent(new CustomEvent('onmessageWS', {
    detail: {
      data: e.data
    }
  }))
}
/**
 * 发送数据但连接未建立时进行处理等待重发
 * @param {any} message 需要发送的数据
 */
const connecting = message => {
  setTimeout(() => {
    if (Socket.readyState === 0) {
      connecting(message)
    } else {
      Socket.send(JSON.stringify(message))
    }
  }, 1000)
}
/**
 * 发送数据
 * @param {any} message 需要发送的数据
 */
export const sendWSPush = message => {
  if (Socket !== null && Socket.readyState === 3) {
    Socket.close()
    createSocket()
  } else if (Socket.readyState === 1) {
    Socket.send(JSON.stringify(message))
  } else if (Socket.readyState === 0) {
    connecting(message)
  }
}
/**断开重连 */
const oncloseWS = () => {
  clearInterval(setIntervalWesocketPush)
  console.log('websocket已断开....正在尝试重连')
  if (Socket.readyState !== 2) {
    Socket = null
    createSocket()
  }
}
/**发送心跳
 * @param {number} time 心跳间隔毫秒 默认5000
 * @param {string} ping 心跳名称 默认字符串ping
 */
export const sendPing = (time = 5000, ping = 'ping') => {
  clearInterval(setIntervalWesocketPush)
  Socket.send(ping)
  setIntervalWesocketPush = setInterval(() => {
    Socket.send(ping)
  }, time)
}

npm install @sven0706/websocket -S

// 在main.js或需要使用的地方引入并建立连接
import { createSocket } from '@sven0706/websocket'
createSocket('wss://api.baidu.com')
// 发送消息
import { sendWSPush } from '@sven0706/websocket'
sendWSPush(data)
// 接收消息
const getsocketData = e => {  // 创建接收消息函数
  const data = e && e.detail.data
  console.log(data)
}
// 注册监听事件
window.addEventListener('onmessageWS', getsocketData)
// 在需要的时候卸载监听事件，比如离开页面
window.removeEventListener('onmessageWS', getsocketData)

/**
 * 建立websocket连接
 * @param {string} url ws地址
 */
createSocket(url)
/**
 * 发送数据
 * @param {any} message 需要发送的数据
 */
 sendWSPush(message)
/**发送心跳
 * @param {number} time 心跳间隔毫秒 默认5000
 * @param {string} ping 心跳名称 默认字符串ping
 */
 sendPing()