[JavaScript知识库] 简单的抢地盘js小游戏实战篇（多人在线对战）

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[JavaScript知识库]简单的抢地盘js小游戏实战篇（多人在线对战）

今天来实现一个简单的多人联机在线对战的小游戏

index.js

const http = require("http");
const app = require("express")();
app.get("/", (req,res)=> res.sendFile(__dirname + "/index.html"))

app.listen(9091, ()=>console.log("Listening on http port 9091"))
const websocketServer = require("websocket").server
const httpServer = http.createServer();
httpServer.listen(9090, () => console.log("Listening.. on 9090"))
//hashmap clients
const clients = {};
const games = {};

const wsServer = new websocketServer({
    "httpServer": httpServer
})
wsServer.on("request", request => {
    //connect
    const connection = request.accept(null, request.origin);
    connection.on("open", () => console.log("opened!"))
    connection.on("close", () => console.log("closed!"))
    connection.on("message", message => {
        const result = JSON.parse(message.utf8Data)
        //I have received a message from the client
        //a user want to create a new game
        if (result.method === "create") {
            const clientId = result.clientId;
            const gameId = guid();
            games[gameId] = {
                "id": gameId,
                "balls": 20,
                "clients": []
            }

            const payLoad = {
                "method": "create",
                "game" : games[gameId]
            }

            const con = clients[clientId].connection;
            con.send(JSON.stringify(payLoad));
        }

        //a client want to join
        if (result.method === "join") {

            const clientId = result.clientId;
            const gameId = result.gameId;
            const game = games[gameId];
            if (game.clients.length >= 3)
            {
                //sorry max players reach
                return;
            }
            const color =  {"0": "Red", "1": "Green", "2": "Blue"}[game.clients.length]
            game.clients.push({
                "clientId": clientId,
                "color": color
            })
            //start the game
            if (game.clients.length === 3) updateGameState();

            const payLoad = {
                "method": "join",
                "game": game
            }
            //loop through all clients and tell them that people has joined
            game.clients.forEach(c => {
                clients[c.clientId].connection.send(JSON.stringify(payLoad))
            })
        }
        //a user plays
        if (result.method === "play") {
            const gameId = result.gameId;
            const ballId = result.ballId;
            const color = result.color;
            let state = games[gameId].state;
            if (!state)
                state = {}

            state[ballId] = color;
            games[gameId].state = state;

        }

    })

    //generate a new clientId
    const clientId = guid();
    clients[clientId] = {
        "connection":  connection
    }

    const payLoad = {
        "method": "connect",
        "clientId": clientId
    }
    //send back the client connect
    connection.send(JSON.stringify(payLoad))

})


function updateGameState(){

    //{"gameid", fasdfsf}
    for (const g of Object.keys(games)) {
        const game = games[g]
        const payLoad = {
            "method": "update",
            "game": game
        }

        game.clients.forEach(c=> {
            clients[c.clientId].connection.send(JSON.stringify(payLoad))
        })
    }

    setTimeout(updateGameState, 500);
}



function S4() {
    return (((1+Math.random())*0x10000)|0).toString(16).substring(1);
}

// then to call it, plus stitch in '4' in the third group
const guid = () => (S4() + S4() + "-" + S4() + "-4" + S4().substr(0,3) + "-" + S4() + "-" + S4() + S4() + S4()).toLowerCase();

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
<h1>Ball Game</h1>
<button id = 'btnCreate'>New Game</button>
<button id = 'btnJoin'>Join Game</button>
<input type = 'text' id = 'txtGameId'>
<div id  = 'divPlayers'></div>
<div id  = 'divBoard'></div>

<script>
    //HTML elements
    let clientId = null;
    let gameId = null;
    let playerColor = null;

    let ws = new WebSocket("ws://localhost:9090")
    const btnCreate = document.getElementById("btnCreate");
    const btnJoin = document.getElementById("btnJoin");
    const txtGameId = document.getElementById("txtGameId");
    const divPlayers = document.getElementById("divPlayers");
    const divBoard = document.getElementById("divBoard");


    //wiring events
    btnJoin.addEventListener("click", e => {

        if (gameId === null)
            gameId = txtGameId.value;

        const payLoad = {
            "method": "join",
            "clientId": clientId,
            "gameId": gameId
        }

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

    })

    btnCreate.addEventListener("click", e => {

        const payLoad = {
            "method": "create",
            "clientId": clientId
        }

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

    })

    ws.onmessage = message => {
        //message.data
        const response = JSON.parse(message.data);
        //connect
        if (response.method === "connect"){
            clientId = response.clientId;
            console.log("Client id Set successfully " + clientId)
        }

        //create
        if (response.method === "create"){
            gameId = response.game.id;
            console.log("game successfully created with id " + response.game.id + " with " + response.game.balls + " balls")
        }


        //update
        if (response.method === "update"){
            //{1: "red", 1}
            if (!response.game.state) return;
            for(const b of Object.keys(response.game.state))
            {
                const color = response.game.state[b];
                const ballObject = document.getElementById("ball" + b);
                ballObject.style.backgroundColor = color
            }

        }

        //join
        if (response.method === "join"){
            const game = response.game;

            while(divPlayers.firstChild)
                divPlayers.removeChild (divPlayers.firstChild)

            game.clients.forEach (c => {

                const d = document.createElement("div");
                d.style.width = "200px";
                d.style.background = c.color
                d.textContent = c.clientId;
                divPlayers.appendChild(d);

                if (c.clientId === clientId) playerColor = c.color;
            })


            while(divBoard.firstChild)
                divBoard.removeChild (divBoard.firstChild)

            for (let i = 0; i < game.balls; i++){

                const b = document.createElement("button");
                b.id = "ball" + (i +1);
                b.tag = i+1
                b.textContent = i+1
                b.style.width = "150px"
                b.style.height = "150px"
                b.addEventListener("click", e => {
                    b.style.background = playerColor
                    const payLoad = {
                        "method": "play",
                        "clientId": clientId,
                        "gameId": gameId,
                        "ballId": b.tag,
                        "color": playerColor
                    }
                    ws.send(JSON.stringify(payLoad))
                })
                divBoard.appendChild(b);
            }




        }
    }
</script>
</body>
</html>

package.json

{
  "name": "websocket-cell-game",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.17.3",
    "websocket": "^1.0.31"
  }
}

?package-lock.json

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  "name": "websocket-cell-game",
  "version": "1.0.0",
  "lockfileVersion": 2,
  "requires": true,
  "packages": {
    "": {
      "name": "websocket-cell-game",
      "version": "1.0.0",
      "license": "ISC",
      "dependencies": {
        "express": "^4.17.3",
        "websocket": "^1.0.31"
      }
    },
    "node_modules/accepts": {
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      "dependencies": {
        "mime-types": "~2.1.34",
        "negotiator": "0.6.3"
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      "engines": {
        "node": ">= 0.6"
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    },
    "node_modules/array-flatten": {
      "version": "1.1.1",
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      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
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      "version": "1.19.2",
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        "iconv-lite": "0.4.24",
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        "qs": "6.9.7",
        "raw-body": "2.4.3",
        "type-is": "~1.6.18"
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最后一步，在项目目录右击在命令行输入?node index.js??

要是报错可以看下有什么express之类的需要下载