从Node.js应用程序向Slack通道发送消息时出错

Question

尝试从Node.js app

发送消息

我使用了以下包https://github.com/xoxco/node-slack

详细参考完整源代码位于https://github.com/sudanvellakovilkanakavel/attendence-app

我无法理解

1. 什么是hook_url

2. 如何定义

错误输出

CJBTDLDD0003:backend kanaks$ node readingFile.js
/Users/kanaks/Desktop/backend/readingFile.js:2
var slack = new Slack(hook_url,options);
                      ^

ReferenceError: hook_url is not defined
    at Object.<anonymous> (/Users/kanaks/Desktop/backend/readingFile.js:2:23)
    at Module._compile (module.js:410:26)
    at Object.Module._extensions..js (module.js:417:10)
    at Module.load (module.js:344:32)
    at Function.Module._load (module.js:301:12)
    at Function.Module.runMain (module.js:442:10)
    at startup (node.js:136:18)
    at node.js:966:3

我的代码

var Slack = require('node-slack');
var slack = new Slack(hook_url,options);

//var slack = new Slack(hook_url,{proxy: http_proxy});

//Trying to send message to slack from Node.js app
//I have used following package https://github.com/xoxco/node-slack

slack.send({
  text: 'Meassage from node.js app to slack!',
  channel: '#attendance',
  username: 'Bot'
});

var fs = require("fs");
//reading the file
fs.readFile('Attendance01-04-2016.dat','utf8',function (err,data){
  if (err) {
    return console.error(err);
  }
  //spliting each line
  var lines = data.split("\n");
  //storeing in array and printing the file
  for (i=0;i<=lines.length;)
  {
    console.log(lines[i]);
    i=i+1;
  }
});