爬虫.js

var http = require('http');
var https = require('https');
var fs = require('fs');

http.get('http://www.cnblogs.com/hustskyking/', function(res) {
  	console.log('响应：' + res.statusCode);
  //console.log(res);
  	var body = [], len = 0;

  	res.on('data', function(chunk){
  		body.push(chunk);
  		len += chunk.length;
  });
  	res.on('end', function(){
  		body = Buffer.concat(body, len);
  		var bodyStr = body.toString();
  		getTitle(bodyStr);
  	//console.log(bodyStr);
  });
}).on('error', function(e) {
  	console.log('错误：' + e.message);
});

var getTitle = function(bodyStr){
 //var matches = bodyStr.match(/href=".*?\.html"/g);
 	var matches = bodyStr.match(/<a(.*?)class="PostTitle"(.*?)<\/a>/g);
  	console.log(matches);
  	var res = matches.join('\n');
  	writeIntoFile(res);

};

var writeIntoFile = function(str){
	fs.writeFile('index.txt', str, function (err) {
	    	if (err) throw err;
	    	console.log('数据已保存～');
	});
};