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//依赖模块
 var fs = require('fs');
 var request = require("request");
 var cheerio = require("cheerio");
 var mkdirp = require('mkdirp');
 
 //目标网址
 var url = 'http://me2-sex.lofter.com/tag/美女摄影?page=';
 
 //本地存储目录
 var dir = './images';
 
 //创建目录
mkdirp(dir, function(err) {
    if(err){
        console.log(err);
    }
 });
 
 //发送请求
request(url, function(error, response, body) {
    if(!error && response.statusCode == 200) {
        var $ = cheerio.load(body);
        $('.img img').each(function() {
            var src = $(this).attr('src');
            console.log('正在下载' + src);
            download(src, dir, Math.floor(Math.random()*100000) + src.substr(-4,4));
            console.log('下载完成');
        });
    }
 });
 
 //下载方法
 var download = function(url, dir, filename){
    request.head(url, function(err, res, body){
        request(url).pipe(fs.createWriteStream(dir + "/" + filename));
    });
 };