Nodejs code snippets you will definitely collect_node.js

The following are four Nodejs code snippets worth collecting for your reference. The specific content is as follows

1. For information about static resource compression and caching in Nodejs, see: Nodejs Building Static Resource Server and File Upload. When I first learned Express, I couldn’t find a suitable method for gzip compression of dynamic files for a long time, only to realize that this is it. Simple...
Add compression module to app.js:
Install first; var compress=require('compression');app.use(compress()); OK, dynamic files can also be gzip compressed;

2. Grab girls’ pictures:

//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));
 });
};

3. Unzip the file

var fs = require('fs'), 
 unzip = require('unzip'); 
//fs.createReadStream('./angular-swipe-master.zip').pipe(unzip.Extract({ path: './' }));
var extract = unzip.Extract({ path: './' }); 
extract.on('error', function(err) { 
 console.log(err); 
}); 
extract.on('finish', function() { 
 console.log("unziped!!"); 
}); 
fs.createReadStream('./angular-swipe-master.zip').pipe(extract);

4. Compressed file

var fs = require("fs");
var zip = require("node-native-zip");
  
var archive = new zip();
  
archive.addFiles([ 
 { name: "app.j", path: "./app.js" },
 { name: "package.json", path: "./package.json" }
], function (err) {
 if (err) return console.log(err);
  
 var buff = archive.toBuffer();
  
 fs.writeFile("./test2.zip", buff, function () {
  console.log("ziped");
 });
});

The above is the entire content of this article. I hope it will be helpful to everyone’s study. Let’s make progress together in the new year!