Javascript Node.js&；Socket.io-无法读取属性'；在'；未定义的

我在使用socket.io和node.js建立websocket连接时遇到错误。这是我的环境：

• 操作系统：Windows7
• 节点：6.9.2
• 净现值：4.0.5
• 套餐：
  • “express”：“^4.14.0”
  • “socket.io”：“1.7.1”
  • “socket.io客户端”：“1.7.1”
  • “ws”：“1.1.1”

尝试websocket连接时，会引发以下错误：

TypeError: Cannot read property 'on' of undefined
    at PerMessageDeflate.decompress (C:\ng-project\node_modules\ws\lib\PerMessageDeflate.js:242:37)
    at Receiver.applyExtensions (C:\ng-project\node_modules\ws\lib\Receiver.js:362:54)
    at C:\ng-project\node_modules\ws\lib\Receiver.js:508:14
    at Receiver.flush (C:\ng-project\node_modules\ws\lib\Receiver.js:347:3)
    at Receiver.opcodes.1.finish (C:\ng-project\node_modules\ws\lib\Receiver.js:541:12)
    at Receiver.expectHandler (C:\ng-project\node_modules\ws\lib\Receiver.js:493:33)
    at Receiver.add (C:\ng-project\node_modules\ws\lib\Receiver.js:103:24)
    at Socket.realHandler (C:\ng-project\node_modules\ws\lib\WebSocket.js:825:20)
    at ZoneDelegate.invokeTask (C:\ng-project\node_modules\zone.js\dist\zone-node.js:265:35)
    at Zone.runTask (C:\ng-project\node_modules\zone.js\dist\zone-node.js:154:47)
    at Socket.ZoneTask.invoke (C:\ng-project\node_modules\zone.js\dist\zone-node.js:335:33)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at readableAddChunk (_stream_readable.js:177:18)
    at Socket.Readable.push (_stream_readable.js:135:10)
    at TCP.onread (net.js:542:20)

查看

ws

模块，我可以看到抛出错误的代码行：

this._inflate.on('error', onError).on('data', onData);

[2016-12-30T19:08:09.219Z] DEBUG: Established socket connection -g9oZM6pEqpFyU_BAAAA
[2016-12-30T19:08:09.275Z] DEBUG: Recieved 'verify subscribe' message: {"token":"short-ish.token","authorization":"long.auth-token"}

\u inflate

是由前面几行创建的zlib

InflateRaw

实例。问题是

InflateRaw#on

函数在我的环境中返回

undefined

我已经尝试安装节点的替代版本来解决这个问题，但没有任何运气。。。更改

ws

包对我来说不是一个可接受的解决方法

编辑1: 添加引发错误的源代码

io.on('connection', (socket) => {
  // Listen for verification subscription requests
  log.debug("Established socket connection " + socket.id);
  socket.on('verify subscribe', (msg) => {
    log.debug("Recieved 'verify subscribe' message: " + JSON.stringify(msg));
    // Do stuff....
  });
});

此代码在发生错误之前输出以下日志消息：

this._inflate.on('error', onError).on('data', onData);

[2016-12-30T19:08:09.219Z] DEBUG: Established socket connection -g9oZM6pEqpFyU_BAAAA
[2016-12-30T19:08:09.275Z] DEBUG: Recieved 'verify subscribe' message: {"token":"short-ish.token","authorization":"long.auth-token"}

---

您的

io

尚未设置。确保你已经完成了

var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);

从文档聊天示例中-

如果不设置

io

，它将是

未定义的

另见：

---

该问题被发现是zone.js的一个bug，并已在更高版本（>0.7.0）中修复。该问题在GitHub上跟踪到：。

此错误可能会产生误导，您可以发布使用WebSocket的代码示例吗？完成-请阅读问题。从提供的堆栈跟踪中可以清楚地看出，

io

变量不是问题所在。