node.js - node.js，需要帮助来修复这个错误“TypeError：对象不是函数”

Question

我正在学习 node.js。在 cloud9 上尝试一些演示。演示很简单，只有2个js文件。我逐行检查，一切似乎都很好。请帮我调试它。

1. 资源.js 文件。

           var util = require('util');
           var EventEmitter = require('events').EventEmitter;
   
           function Resource(m){
   
               var maxEvents = m;
               var self = this;
   
               process.nextTick(function(){
                   var count = 0;
   
                   self.emit('start');
                   var t = setInterval(function(){
                       self.emit('data', ++count);
   
                       if(count === maxEvents){
                           self.emit('end', count);
                           clearInterval(t);
                       }
                   }, 10);
               });
   
           };
   
           util.inherits(Resource, EventEmitter);
   

2. 7-extEmitter.js

           var Resource = require('./resource');
   
   
           var r = new Resource(7);
   
   
           r.on('start', function(){
               console.log("I've started!");
           });
   
           r.on('data', function(d){
               console.log("    I received data -> " + d);
           });
   
           r.on('end', function(t){
               console.log("I'm done, with " + t + " data events.");
           });
   

这是我收到的错误消息：

            Your code is running at 'http://node.myw714.c9.io'.
            Important: use 'process.env.PORT' as the port and 'process.env.IP' as the host in your scripts!
            /var/lib/stickshift/511e07b5500446f25c0001bd/app-root/data/407149/7-extEmitter.js:4
            var r = new Resource(7);

              ^
            TypeError: object is not a function
                at Object. (/var/lib/stickshift/511e07b5500446f25c0001bd/app-root/data/407149/7-extEmitter.js:4:9)
                at Module._compile (module.js:449:26)
                at Object.Module._extensions..js (module.js:467:10)
                at Module.load (module.js:356:32)
                at Function.Module._load (module.js:312:12)
                at Module.runMain (module.js:492:10)
                at process.startup.processNextTick.process._tickCallback (node.js:244:9)

Answer 1

您只需要删除该初始化代码。

    var r = require('./resource');


    r.on('start', function(){
        console.log("I've started!");
    });

    r.on('data', function(d){
        console.log("    I received data -> " + d);
    });

    r.on('end', function(t){
        console.log("I'm done, with " + t + " data events.");
    });

并在resource.js中添加这一行，如果你想让它更通用，你应该改变函数结构以允许设置值m。

module.exports = new Resource(7);

Answer 2

在 resource.js 文件中的 utils.inherit 下，您只需添加以下内容：

module.exports = Resource;  

其余的代码都很好。