使用node.js制作简易爬虫

var sys = require("sys"),
http = require("http"),
fs = require("fs");
var url = "http://newbbs.fengniao.com/forum/forum_125.html";
var data = "";
//创建正则，过滤html
var reg = /<div\s*class="recommendSub">\s*<a\s*href="(.*?)"\s*class="pic"\s*title="(.*?)"/g;
var result = [],
timeStamp = 0;
// 创建一个请求
var req = http.request(url, function (res) {
// 设置显示编码
timeStamp = new Date().getTime();
res.setEncoding("utf8");
res.on('data', function (chunk) {
data += chunk;
});
// 响应完毕时间出发，输出 data
res.on('end', function () {
while (match = reg.exec(data)) {
result.push({
title: match[1],
url: match[2]
});
}
writeFile(result);
});
});
// 发送请求
req.end();
function writeFile(r) {
var str = '';
for (var i = 0, _len = r.length; i < _len; i++) {
str += r[i].title + '\n' + r[i].url + '\n';
}
//数据拼接结束后，写入s.txt文件
fs.writeFile('s.txt', str, function (err) {
if (err) {
throw err;
}
console.log('耗时约' + Math.ceil((new Date().getTime() - timeStamp) / 1000) + 's');
console.log('数据已写入文件');
});
}

node spider.js