//依赖模块

var fs = require('fs');

var request = require("request");

var cheerio = require("cheerio");

var mkdirp = require('mkdirp');

var http= require('http');

//目标网址

var url = 'http://image.baidu.com';

//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);

//找到img所在标签目录

var images = $('.img_pic_wrap_layer');

images.each(function(item) {

// 通过标签名找到img

var img = $(this).find('img')

var src = img.attr('src') + "";

console.log(src);

console.log('正在下载' + src);

// 调用下载方法（资源路径，本地保存目录，文件名）

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));

});

};