Question

我有以下代码：

var io = require('socket.io-client');

function connect_to_room(callback){
    console.log(typeof io.connect);
    var socket = io.connect('http://website.com/socket/');
    socket.on('connect', function(){
        console.log("connected");
        socket.on('event', function(data){
            console.log("event happened");
            console.log(data);
        });
        socket.on('disconnect', function(){
            console.log("disconnected");
        });
    });
}

exports.connect = connect_to_room();

当我调用connect_to_room()时，它会在控制台中记录“function”，然后抛出这个错误：

TypeError: Property 'connect' of object #<Object> is not a function
    at Request._callback (C:\Users\randomuser\Downloads\somecode\somecode\dev\init.js:151:35)
    at Request.self.callback (C:\Users\randomuser\Downloads\somecode\somecode\dev\node_modules\request\request.js:121:22)
    at Request.EventEmitter.emit (events.js:98:17)
    at Request.<anonymous> (C:\Users\randomuser\Downloads\somecode\somecode\dev\node_modules\request\request.js:978:14)
    at Request.EventEmitter.emit (events.js:117:20)
    at IncomingMessage.<anonymous> (C:\Users\randomuser\Downloads\somecode\somecode\dev\node_modules\request\request.js:92
9:12)
    at IncomingMessage.EventEmitter.emit (events.js:117:20)
    at _stream_readable.js:920:16
    at process._tickCallback (node.js:415:13)

我在这里做错了什么？

node --version返回v0.10.26

package.json有依赖关系（已全部安装）：

"dependencies" : {
    "jsonfile"          : "1.1.1",
    "log4js"            : "0.6.12",
    "mkdirp"            : "0.3.5",
    "npm"               : "1.4.4",
    "request"           : "2.34.0",
    "jsdom"             : "0.10.2",
    "socket.io-client"  : "0.9.16"
},

Answer 1

你有一个错字

var sock

应该是

var socket

另一个问题：

exports.connect = connect_to_room();

应该是

exports.connect = connect_to_room;

Answer 2

试试这个：

var socket = require('socket.io-client')('http://website.com/socket/');

function connect_to_room(callback){
    console.log(typeof io.connect);
    socket.on('connect', function(){
        console.log("connected");
        socket.on('event', function(data){
            console.log("event happened");
            console.log(data);
        });
        socket.on('disconnect', function(){
            console.log("disconnected");
        });
    });
}

exports.connect = connect_to_room(function(back){ });

socket.io-client：无法调用“connect”函数

2 个答案: