test.js

var request = require('request');
var cheerio = require('cheerio');
var fs = require('fs');
var step =require('step');

step(

  function readUrl(){

		console.log("readUrl")

		request('http://www.daum.net', this);

	},
	function parseImg(err, data){

		console.log("parseImg")
		
		var $ = cheerio.load(data.body);
		
		var imgUrl = [];

	 	$('img').each(function(index, el){
	 
	 		imgUrl.push($(el).attr('src'))
	        // console.log(  );
	    });

		return imgUrl;
	},
	function makeFile(err, imgUrl){

		console.log("makeFile")

	    fs.writeFile('daum-imgurl.txt', imgUrl, this);
	},
	function done(err, data){

		console.log('It\'s saved!');
	}

);


return;


request('http://www.daum.net', function (error, response, body) {
  if (!error && response.statusCode == 200) {

  	// console.log(body);

  	var $ = cheerio.load(body);

  	var imgUrl = [];

 	$('img').each(function(index, el){
 
 		imgUrl.push($(el).attr('src'))
        // console.log(  );
    });

    fs.writeFile('daum-imgurl.txt', imgUrl, function (err) {
	  if (err) throw err;
	  console.log('It\'s saved!');
	});

  }
})