Question

我正在开发一个使用express的节点应用程序，它有一个聊天系统，我正在使用socket.io但是我收到了这个错误

Server is listening on 3000
made socket connection
C:\Users\User\MyFolder\Projects\FMIS\app\app.js:139
socket.on('chat', function(data){
       ^

TypeError: socket.on is not a function
at Namespace.<anonymous> 
(C:\Users\User\MyFolder\Projects\FMIS\app\app.js:139:12)
at emitOne (events.js:116:13)
at Namespace.emit (events.js:211:7)
at Namespace.emit 
at _combinedTickCallback (internal/process/next_tick.js:131:7)
at process._tickCallback (internal/process/next_tick.js:180:9)

这是我在'app.js

中尝试做的

var reload = require('reload');
var bodyParser =  require('body-parser');
var app = express();
var  socket = require('socket.io');
app.set('port', process.env.PORT || 3000);
app.set('view engine', 'ejs');
app.set('views','app/views');
app.locals.siteTitle = "FMIS";
app.use(express.static('app/public'));

app.use(require('./routes/Chat_api'));
app.use(require('./routes/Chat'));

var server = app.listen(app.get('port'),()=>{
console.log('Server is listening on '+ app.get('port'));
});

var io = socket(server);

io.on('connection',function(){
    console.log('made socket connection');
    socket.on('chat', function(data){
        // io.sockets.emit('chat',data);
        console.log(data);
    });
});
reload(server, app);

我发送并接收来自客户端的数据

 socket.emit('chat',{
          user: chatUsername.value,
          Message: chatMessage.value
        });

socket.on('chat',function(data){
        // showMessage(data);
        console.log(data);
    });

Answer 1

您正在使用socket.io的库引用，它不包含函数属性on。你想要做的是使用提供给你的套接字作为io.on连接事件回调的参数。要解决此问题，您只需将socket添加到回调函数的参数即可。像这样：

io.on('connection',function(socket) {
  console.log('made socket connection');
  socket.on('chat', function(data){
    // io.sockets.emit('chat',data);
    console.log(data);
  });
});

现在socket指的是连接提供给您的套接字。有关详细信息，请参阅this example。

socket.io TypeError：socket.on不是函数

1 个答案: