nodejs——js 实现webSocket 兼容移动端

nodejs——js 实现webSocket 兼容移动端

//服务器端

//npm install --save ws

const express = require('express');

const http = require('http');

const url = require('url');

const WebSocket = require('ws');

const app = express();

app.use(function (req, res) {

    res.send({ msg: "hello" });

});

const server = http.createServer(app);

const wss = new WebSocket.Server({ server });

var stocks = {

    "con1": 95.0,

    "con2": 50.0,

    "con3": 300.0,

    "con4": 550.0,

    "con5": 35.0

}

function randomInterval(min, max) {

    return Math.floor(Math.random() * (max - min + 1) + min);

}

var stockUpdater;

var randomStockUpdater = function() {

    for (var symbol in stocks) {

        if(stocks.hasOwnProperty(symbol)) {

            var randomizedChange = randomInterval(-150, 150);

            var floatChange = randomizedChange / 100;

            stocks[symbol] += floatChange;

        }

    }

    var randomMSTime = randomInterval(500, 2500);

    stockUpdater = setTimeout(function() {

        randomStockUpdater();

    }, randomMSTime);

}

randomStockUpdater();

wss.on('connection', function (ws) {

    var sendStockUpdates = function (ws) {

        if (ws.readyState == 1) {

            var stocksObj = {};

            for (var symbol in clientStocks) {

                stocksObj[symbol] = stocks[symbol];

            }

            if (stocksObj.length !== 0) {

                ws.send(JSON.stringify(stocksObj));//需要将对象转成字符串。WebSocket只支持文本和二进制数据

                console.log("更新", JSON.stringify(stocksObj));

            }

        }

    }

    var clientStockUpdater = setInterval(function () {

        sendStockUpdates(ws);

    }, 5000);

    ws.on('message', function (message) {

        var stockRequest = JSON.parse(message);//根据请求过来的数据来更新。

        console.log("收到消息", stockRequest);

        clientStocks = stockRequest;

        sendStockUpdates(ws);

    });

});

server.listen(8080, function listening() {

    console.log('Listening on %d', server.address().port);

});

//客户端 vue，写成普通html 直接用浏览器访问也可以

   <template>

    <div>

        <button @click="check"> 启动 </button>

        <div id="con1"></div>

        <div id="con2"></div>

        <div id="con3"></div>

        <div id="con4"></div>

        <div id="con5"></div>

    </div>

</template>

<script>

    export default {

        data () {

            return {

            }

        },

        methods:{

            check(){

                var isClose = false;

                var stocks = {

                    "con1": 0, "con2": 0, "con3": 0, "con4": 0, "con5": 0

                };

                var WebSocketsExist = true;

                try {

                    var ws = new WebSocket("ws://10.20.11.180:8080");

                } catch (ex) {

                    try

                    {

                        ws = new MozWebSocket("ws://10.20.11.180:8080");

                    }

                    catch(ex)

                    {

                        WebSocketsExist = false;

                    }

                }

                if (WebSocketsExist) {

                    alert("您的浏览器支持WebSocket. 您可以尝试连接到聊天服务器!");

                } else {

                    alert("您的浏览器不支持WebSocket。请选择其他的浏览器再尝试连接服务器。");

                }

                function updataUI() {

                    ws.onopen = function (e) {

                        console.log('Connection to server opened');

                        isClose = false;

                        ws.send(JSON.stringify(stocks));

                        console.log("sened a mesg");

                    }

                    //更新UI

                    var changeStockEntry = function (symbol, originalValue, newValue) {

                        document.getElementById(symbol).innerHTML = symbol+' : '+newValue.toFixed(2);

                    }

                    // 处理受到的消息

                    ws.onmessage = function (e) {

                        var stocksData = JSON.parse(e.data);

                        console.log(stocksData)

                        console.log('-----------------------------------------');

                        for (var symbol in stocksData) {

                            if (stocksData.hasOwnProperty(symbol)) {

                                changeStockEntry(symbol, stocks[symbol], stocksData[symbol]);

                                stocks[symbol] = stocksData[symbol];

                            }

                        }

                    };

                }

                updataUI();

          }

        },

    }

</script>

https://www.cnblogs.com/stoneniqiu/p/5402311.html