Javascript 为什么我会得到；TypeError:对象不是函数；运行这个示例node.js代码？

为什么运行下面显示的代码时会出现错误？（这是在Coursera上斯坦福大学“创业工程”课程的一个家庭作业中使用的：）

该课程于2013年6月至9月开课，所以可能是node或csv的更新破坏了脚本？作业不是关于修改脚本，所以这个问题不是“作弊”，而且课程目前也没有运行

因此，环境是： Ubuntu 14.04（内核3-13-0-29-generic）， 节点v0.11.13， npm v1.4.9

我在主目录中安装了

npm

'd csv、accounting util和restler，脚本也在那里

这让我完全不知所措-(

错误消息：

[ubuntu@ip-xxx-xxx-xxx-xxx:~]$node market-research.js
Invoked at command line.
Wrote market-research.csv
Symbol  Name    Market Cap      Previous Close Price    P/E Ratio       Shares  EPS   Earnings
/home/ubuntu/market-research.js:47
    csv()
    ^
TypeError: object is not a function
    at csv2console (/home/ubuntu/market-research.js:47:5)
    at Request.response2console (/home/ubuntu/market-research.js:65:13)
    at Request.EventEmitter.emit (events.js:110:17)
    at Request.mixin._fireSuccess (/home/ubuntu/node_modules/restler/lib/restler.js:226:10)
    at /home/ubuntu/node_modules/restler/lib/restler.js:158:20
    at IncomingMessage.parsers.auto (/home/ubuntu/node_modules/restler/lib/restler.js:394:7)
    at Request.mixin._encode (/home/ubuntu/node_modules/restler/lib/restler.js:195:29)
    at /home/ubuntu/node_modules/restler/lib/restler.js:154:16
    at Request.mixin._decode (/home/ubuntu/node_modules/restler/lib/restler.js:170:7)
    at IncomingMessage.<anonymous> (/home/ubuntu/node_modules/restler/lib/restler.js:147:14)
[ubuntu@ip-xxx-xxx-xxx-xxx:~]$

脚本创建的market-research.csv的内容：

    "GOOG","Google Inc.",386.6B,569.20,29.49
    "FB","Facebook, Inc.",194.5B,73.855,78.49
    "AAPL","Apple Inc.",613.8B,102.25,16.49
    "YHOO","Yahoo! Inc.",38.302B,38.31,33.11
    "MSFT","Microsoft Corpora",374.3B,44.88,17.06
    "LNKD","LinkedIn Corporat",27.747B,223.26,N/A
    "CRM","Salesforce.com In",36.577B,58.29,N/A

---

Quantas 94重，谢谢你的提示

12个月前，节点csv的版本是0.2，但现在是0.4，API也发生了变化

我现在编写了csv控制台函数，如下所示：

// part of file market-script.js
// edited by Jeff Moye (Moyesoft)
// no attribution in the original file

var csv2console = function(csvfile, headers) {
  console.log(headers.join("\t"));
  var parser = csv.parse();    //create the parser                                                                                                            

  parser.on('readable', function(){    //the 'record' event no longer exists                                                                                  
                                       // so instead we write a handler for the                                                                               
                                       // 'readable' event                                                                                                    
    while(record = parser.read()){     // and read() each record in a loop                                                                                                                  
      var shares = Math.round(marketCapFloat(record[2])/record[3], 0);
      var eps = (record[3]/record[4]).toFixed(3);
      var earnings = accounting.formatMoney(eps * shares);
      outrow = record.concat([shares, eps, earnings]);
      console.log(outrow.join("\t"));
    }
  });

  parser.on('error', function(err){    // we may as well have an error handler                                                                                
    console.log(err.message);
  });

  fs.createReadStream(csvfile).pipe(parser);    //open file as a stream and pipe it to the parser                                                             
};

---

模块csv是否正确安装？您使用的是什么版本以及在何处使用？在使用之前是否尝试记录csv变量？是否确定使用的是正确的版本？当前版本的API似乎与您的代码不同。我认为csv不是一个函数。csv是一个对象及其公开函数csv.generaste，csv.parse，csv.transform，csv.stringify；因此只能使用这些函数中的任何一个…谢谢！我自己永远不会想到这一点。我正在编写结束后的问题如何解决它？

// part of file market-script.js
// edited by Jeff Moye (Moyesoft)
// no attribution in the original file

var csv2console = function(csvfile, headers) {
  console.log(headers.join("\t"));
  var parser = csv.parse();    //create the parser                                                                                                            

  parser.on('readable', function(){    //the 'record' event no longer exists                                                                                  
                                       // so instead we write a handler for the                                                                               
                                       // 'readable' event                                                                                                    
    while(record = parser.read()){     // and read() each record in a loop                                                                                                                  
      var shares = Math.round(marketCapFloat(record[2])/record[3], 0);
      var eps = (record[3]/record[4]).toFixed(3);
      var earnings = accounting.formatMoney(eps * shares);
      outrow = record.concat([shares, eps, earnings]);
      console.log(outrow.join("\t"));
    }
  });

  parser.on('error', function(err){    // we may as well have an error handler                                                                                
    console.log(err.message);
  });

  fs.createReadStream(csvfile).pipe(parser);    //open file as a stream and pipe it to the parser                                                             
};