1
我在跟着聊天example這有點舊，但我確實從這開始。socket.io無法調用未定義的方法'emit'（使用node.js和express，jade）
然而，之後把那個頁面描述所有的工作我得到以下錯誤：
TypeError: Cannot call method 'emit' of undefined
at /Users/juneyoungoh/Documents/Nodejs/ChatSample/app.js:109:29
at Array.forEach (native)
at userJoined (/Users/juneyoungoh/Documents/Nodejs/ChatSample/app.js:108:33)
at Socket.<anonymous> (/Users/juneyoungoh/Documents/Nodejs/ChatSample/app.js:62:7)
at Socket.EventEmitter.emit (events.js:98:17)
at Socket.onevent (/Users/juneyoungoh/Documents/Nodejs/ChatSample/node_modules/socket.io/lib/socket.js:330:8)
at Socket.onpacket (/Users/juneyoungoh/Documents/Nodejs/ChatSample/node_modules/socket.io/lib/socket.js:290:12)
at Client.ondecoded (/Users/juneyoungoh/Documents/Nodejs/ChatSample/node_modules/socket.io/lib/client.js:193:14)
at Decoder.Emitter.emit (/Users/juneyoungoh/Documents/Nodejs/ChatSample/node_modules/socket.io/node_modules/socket.io-parser/node_modules/component-emitter/index.js:134:20)
at Decoder.add (/Users/juneyoungoh/Documents/Nodejs/ChatSample/node_modules/socket.io/node_modules/socket.io-parser/index.js:247:12)
的源代碼的問題部分是
function userJoined(uName) {
Object.keys(socketsOfClients).forEach(function(sId){
io.sockets.sockets[sId].emit('userJoined ', {'userName' : uName});
});
}
所以我追蹤的被攝體io.sockects和我得到了什麼在屏幕下面是
{ name: '/',
server:
{ nsps: { '/': [Circular] },
_path: '/socket.io',
_serveClient: true,
_adapter: [Function: Adapter],
_origins: '*:*',
sockets: [Circular],
eio:
{ clients: [Object],
clientsCount: 1,
pingTimeout: 60000,
pingInterval: 25000,
upgradeTimeout: 10000,
maxHttpBufferSize: 100000000,
transports: [Object],
allowUpgrades: true,
allowRequest: [Function],
cookie: 'io',
ws: [Object],
_events: [Object] },
httpServer:
{ domain: null,
_events: [Object],
_maxListeners: 10,
_connections: 7,
connections: [Getter/Setter],
_handle: [Object],
_usingSlaves: false,
_slaves: [],
allowHalfOpen: true,
httpAllowHalfOpen: false,
timeout: 120000,
_connectionKey: '4:0.0.0.0:3000' },
engine:
{ clients: [Object],
clientsCount: 1,
pingTimeout: 60000,
pingInterval: 25000,
upgradeTimeout: 10000,
maxHttpBufferSize: 100000000,
transports: [Object],
allowUpgrades: true,
allowRequest: [Function],
cookie: 'io',
ws: [Object],
_events: [Object] } },
sockets:
[ { nsp: [Circular],
server: [Object],
adapter: [Object],
id: 'AmJ6dbF_Y_Kus1tcAAAB',
client: [Object],
conn: [Object],
rooms: [Object],
acks: {},
connected: true,
disconnected: false,
handshake: [Object],
_events: [Object] } ],
connected:
{ AmJ6dbF_Y_Kus1tcAAAB:
{ nsp: [Circular],
server: [Object],
adapter: [Object],
id: 'AmJ6dbF_Y_Kus1tcAAAB',
client: [Object],
conn: [Object],
rooms: [Object],
acks: {},
connected: true,
disconnected: false,
handshake: [Object],
_events: [Object] } },
fns: [],
ids: 0,
acks: {},
adapter:
{ nsp: [Circular],
rooms: { AmJ6dbF_Y_Kus1tcAAAB: [Object] },
sids: { AmJ6dbF_Y_Kus1tcAAAB: [Object] },
encoder: {} },
_events: { connection: [Function] } }
我完全理解爲什麼我不能得到io.sockets.sockets[sId]，因爲io.sockets.sockets沒有密鑰。
要修復這種結構，我應該在connection事件上做額外的工作嗎？ 我現在的連接處理程序是
io.sockets.on('connection', function(socket){
socket.on('set username', function(userName){
if (clients[userName] === undefined) {
clients[userName] = socket.id;
socketsOfClients[socket.id] = userName;
userNameAvailable(socket.id, userName);
userJoined(userName);
} else {
if (clients[userName] == socket.id) {
} else {
userNameAlreadyInUse(socket.id, userName);
}
}
});
}
謝謝！