Vue页面template
<template>
<div>
<canvas style=" 80%!important;height: auto!important;" id="canvas"></canvas>
<br/>{{charId}}
</div>
</template>
Vue页面js
<script>
export default {
data() {
return {
websock: null,//建立的连接
charId: s.uuid(),//随机生成的UUID
lockReconnect: false,//是否真正建立连接
timeout: 28*1000,//30秒一次心跳
timeoutObj: null,//心跳心跳倒计时
serverTimeoutObj: null,//心跳倒计时
timeoutnum: null,//断开 重连倒计时
lastRunTime: Date.now(),//上次播放声音的时间
};
},
created() {
//页面刚进入时开启长连接
this.initWebSocket();
},
destroyed: function() {
//页面销毁时关闭长连接
this.websocketclose();
},
methods: {
initWebSocket(){//建立连接
//初始化weosocket
//const wsuri = "ws://sms.填写您的地址.com/websocket/" + this.charId; //ws地址
const wsuri = ""
//建立连接
this.websock = new WebSocket(wsuri);
//连接成功
this.websock.onopen = this.websocketonopen;
//连接错误
this.websock.onerror = this.websocketonerror;
//接收信息
this.websock.onmessage = this.websocketonmessage;
//连接关闭
this.websock.onclose = this.websocketclose;
},
reconnect() {//重新连接
var that = this;
if(that.lockReconnect) {
return;
};
that.lockReconnect = true;
//没连接上会一直重连，设置延迟避免请求过多
that.timeoutnum && clearTimeout(that.timeoutnum);
that.timeoutnum = setTimeout(function () {
//新连接
that.initWebSocket();
that.lockReconnect = false;
},5000);
},
reset(){//重置心跳
var that = this;
//清除时间
clearTimeout(that.timeoutObj);
clearTimeout(that.serverTimeoutObj);
//重启心跳
that.start();
},
start(){//开启心跳
var self = this;
self.timeoutObj && clearTimeout(self.timeoutObj);
self.serverTimeoutObj && clearTimeout(self.serverTimeoutObj);
self.timeoutObj = setTimeout(function(){
//这里发送一个心跳，后端收到后，返回一个心跳消息，
if (self.websock.readyState == 1) {//如果连接正常
self.websock.send("heartCheck");
}else{//否则重连
self.reconnect();
}
self.serverTimeoutObj = setTimeout(function() {
//超时关闭
self.websock.close();
}, self.timeout);
}, self.timeout)
},
playSound(){//播放声音
var borswer = window.navigator.userAgent.toLowerCase();
if (borswer.indexOf("ie") >= 0) {
//IE内核浏览器
var strEmbed = '<embed name="embedPlay" src="/static/assets/mp3/dingdong.wav" autostart="true" hidden="true" loop="false"></embed>';
if ($("body").find("embed").length <= 0)
$("body").append(strEmbed);
var embed = document.embedPlay;
//浏览器不支持 audion，则使用 embed 播放
embed.volume = 100;
//embed.play();这个不需要
} else {
//非IE内核浏览器
var strAudio = "<audio id='audioPlay' type='audio/mpeg' src='/static/assets/mp3/dingdong.wav' hidden='true'>";
if ($("body").find("audio").length <= 0)
$("body").append(strAudio);
var audio = document.getElementById("audioPlay");
var currentTime = Date.now();
var protectTime = 500;//设置保护性延时 单位毫秒，不要小于50 建议100以上
if((currentTime - this.lastRunTime) < protectTime){
return;//两次执行太过频繁，直接退出
}
if(audio.paused){
audio.play();
}else{
audio.pause();
}
this.lastRunTime = Date.now();
//浏览器支持 audion
// if (audio.paused){
// audio.play();
// }
}
},
websocketonopen() {//连接成功事件
//生成二维码(参数内容，canvas的id)
s.qrcode(this.charId,"canvas")
//提示成功
s.success("连接成功",3)
//开启心跳
this.start();
},
websocketonerror(e) {//连接失败事件
//错误
console.log("WebSocket连接发生错误");
//错误提示
s.error("Websocket error, Check you internet!")
//重连
this.reconnect();
},
websocketclose(e) {//连接关闭事件
//关闭
console.log("connection closed (" + e.code + ")");
//提示关闭
s.error("连接已关闭",3);
//重连
this.reconnect();
},
websocketonmessage(event) {//接收服务器推送的信息
//打印收到服务器的内容
console.log(event.data);
//收到服务器信息，心跳重置
this.reset();
//播放声音
this.playSound();
},
websocketsend(msg) {//向服务器发送信息
//数据发送
this.websock.send(msg);
},
}
};
</script>
其他js
/**
* 返回uuid
*/
s.uuid = function () {
function S4() {
return (((1+Math.random())*0x10000)|0).toString(16).substring(1);
}
return (S4()+S4()+"-"+S4()+"-"+S4()+"-"+S4()+"-"+S4()+S4()+S4());
}
import QRCode from 'qrcode'
/**
* body 二维码的内容
* 生成二维码的 画布id
*/
s.qrcode = function(body,id){
var canvas = document.getElementById(id)
QRCode.toCanvas(canvas, body, function (error) {
if (error){
console.error(error)
} else{
console.log('success!');
}
})
}
部分截图
QQ截图20181218170335.jpg
QQ截图20181218170907.jpg
用途
- 即使通讯
- 消息通知
- 封装当前页面地址到APP内
使用电视(安卓)安装APP
扫码进行长连接通信，传递权限和一些参数，当前页面获取参数进行展示不同的可视化数据或报表等信息。