正在获取丢失的错误处理程序套接字消息，无法读取属性'timerID'使用Node.js和Socket.i

Getting missing error handler socket message, cannot read property 'timerID' of undefined using Node.js and Socket.io

本文关键字：属性 读取 timerID 使用 Socket js Node 获取 错误 处理 消息      更新时间：2024-01-18

am得到以下错误，该错误使用Node.js和socket.io.运行服务器

错误

C:'Users'황진우'Desktop'nodejstest>node app2
Server Running at http://127.0.0.1:52273
Missing error handler on `socket`.
TypeError: Cannot read property 'timerID' of undefined
    at Socket.<anonymous> (C:'Users'황진우'Desktop'nodejstest'app2.js:97:27)
    at emitOne (events.js:77:13)
    at Socket.emit (events.js:169:7)
    at Socket.onevent (C:'Users'황진우'Desktop'nodejstest'node_modules'socket.io'lib'socket.js:335:8)
    at Socket.onpacket (C:'Users'황진우'Desktop'nodejstest'node_modules'socket.io'lib'socket.js:295:12)
    at Client.ondecoded (C:'Users'황진우'Desktop'nodejstest'node_modules'socket.io'lib'client.js:193:14)
    at Decoder.Emitter.emit (C:'Users'황진우'Desktop'nodejstest'node_modules'socket.io'node_modules'socket.io-parser'node_modules'component-emitter'index.js:134:20)
    at Decoder.add (C:'Users'황진우'Desktop'nodejstest'node_modules'socket.io'node_modules'socket.io-parser'index.js:247:12)
    at Client.ondata (C:'Users'황진우'Desktop'nodejstest'node_modules'socket.io'lib'client.js:175:18)
    at emitOne (events.js:77:13)

代码如下。

服务器端app2.js

var fs = require('fs');
var ejs = require('ejs');
var http = require('http');
var express = require('express');

var counter = 0;
function Product(name, image, price, count){
    this.index = counter++;
    this.name = name; 
    this.image = image;
    this.price = price;
    this.count = count;
};
var products = [
    new Product('JavaScript','chrome.png', 28000 , 30 ),
    new Product('jQuery','chrome.png',28000 , 30),
    new Product('Node.js','chrome.png', 32000, 30),
    new Product('Socket.io','chrome.png', 17000, 30),
    new Product('Connect','chrome.png', 18000, 30),
    new Product('Express','chrome.png', 31000, 30),
    new Product('EJS','chrome.png', 12000, 30)
];

var app = express();
var server = http.createServer(app);

app.use(express.static(__dirname+'/public'));

app.route('/').get(function(req,res){
    var HTMLPage = fs.readFileSync('HTMLPage2.html','utf-8');

    res.send(ejs.render(HTMLPage,{
        products : products
    }));
});

server.listen(52273, function(){
    console.log('Server Running at http://127.0.0.1:52273');
});

var io = require('socket.io').listen(server);
io.sockets.on('connection', function(socket){
    function onReturn(index){
        products[index].count++;

        clearTimeout(cart[index].timerID);

        delete cart[index];

        io.sockets.emit('count', {
            index : index,
            count : products[index].count
        });
    };

    var cart = {};

    socket.on('cart',function(index){
        products[index].count--;

        cart[index] = {};
        cart[index].index = index;
        cart[index].timerID = setTimeout(function(){
            onReturn(index);
        }, 1000*5);

        io.sockets.emit('count',{
            index : index,
            count : products[index].count
        });
    });


    socket.on('buy', function(index){
        clearTimeout(cart[index].timerID);

        delete cart[index];

        io.sockets.emit('count', {
            index: index,
            count: products[index].count
        });
    });

    socket.on('return', function(index){
        onReturn(index);
    });
});

客户端HTMLPage2.HTML

<!DOCTYPE html>
<html>
    <head>
        <meta name="viewport" content="width=device-width, initial-scale=1" />
        <script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
        <link rel="stylesheet" href="http://code.jquery.com/mobile/1.3.1/jquery.mobile-1.3.1.min.css" />
        <script src="http://code.jquery.com/mobile/1.3.1/jquery.mobile-1.3.1.min.js"></script>
        <script src="/socket.io/socket.io.js"></script>
        <script>
            $(document).ready(function() {
                function changeIcon(parent, from, to){
                    var target = $('.ui-btn-text', parent).next();
                    target.removeClass(from).addClass(to);
                }
                function changeCount(index, count){
                    $('li[data-index = '+index + '] .ul-li-count').html(count);
                }
                var socket = io.connect();

                socket.on('count', function(data){
                    changeCount(data.index, data.count);
                });
                $('.product > a[data-icon]').click(function(){
                    if($(this).attr('toggle') != 'off'){
                        var index = $(this).attr('data-index');

                        socket.emit('cart', Number(index));

                        changeIcon(this, 'ui-icon-check', 'ui-icon-back');

                        $(this).attr('toggle', 'off');
                    }else{
                        var index = $(this).attr('data-index');
                        if(confirm('물건을 구매하겠습니까?')){
                            socket.emit('buy',Number(index));

                            $(this).parent().remove();
                            $('#listview').listview('refresh');
                        }else{
                            socket.emit('return',Number(index));

                            changeIcon(this, 'ui-icon-back','ui-icon-check');
                        }
                        $(this).attr('toggle','on');
                    }
                });
            });
        </script>
    </head>
    <body>
        <div data-role = "page">
            <div data-role = "header">
                <h1>Store</h1>
            </div>
            <div data-role="content">
                <ul id="listview" data-role="listview" data-insert="true" data-filter="true">
                <li data-role="list-divider">products</li>
                <% products.forEach(function (item, index) { %>
                <li class="product" data-index="<% item.index %>">
                    <a href="#">
                        <img src="chrome.png" />
                        <h3><%= item.name %></h3>
                        <p><%= item.price %>원</p>
                        <span class="ul-li-count"><%= item.count %></span>
                    </a>
                    <a href="#" data-icon="check" data-index="<%= item.index %>"></a>
                </li>
                <% }); %>
                </ul>
            </div>
            </div>          
    </body>
</html>

我在这一行弄错了clearTimeout（cart[index].timerID）；'

请帮助我解决此错误。

当用户想要直接购买物品而不将其放在购物车上时，会触发此错误。在这种情况下，cart事件将永远不会被激发，因此cart[index]将永远不存在。

socket.on('buy', function(index){
    if(cart[index]){
        clearTimeout(cart[index].timerID);

        delete cart[index];
    }
    io.sockets.emit('count', {
        index: index,
        count: products[index].count
    });
});

此外，您应该这样处理错误事件：

socket.on('error',function(er){
    console.log(er);
});
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