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NODE学习:利用nodeJS去抓网页的信息

2024-07-29 00:48:05   220人阅读

1：引用模块"http" (执行命令node app.js "http://www.baidu.com")

//app.js
var http = require(‘http‘);var url = require(‘url‘);function spider(u,cb){    http.get( url.parse(u), function(res){        var d = ‘‘        res.on(‘data‘,function(chunk){            d += chunk;        })        res.on(‘end‘,function(){            console.log(‘spider_end && do cb‘);            cb(d);        })    });};var u = "";if( require.main === module ) {    u = process.argv[2]};spider(u,function( data ){
　　//这个返回的是网页内容的信息;    console.log( data );});

 

2：引用模块nodegrass： (执行命令node app.js "http://www.baidu.com")

//app.js
var url = "http://www.cnblogs.com/xiaochao12345/archive/2014/10/23/4044950.html";var ng = require(‘nodegrass‘);if(require.main === module) {    console.log( process.argv );    url = process.argv[2];}ng.get(url,function(data){
　　//这个返回的是网页内容的信息;
console.log(data); },‘utf8‘);

 

3：引用模块superagent： (执行命令node app.js "http://www.baidu.com")

//app.js
var url = "http://www.cnblogs.com/xiaochao12345/archive/2014/10/23/4044950.html";var superagent = require("superagent");if(require.main === module) {    console.log( process.argv );    url = process.argv[2];};superagent.get(url)    .end(function (err, res) {        console.log(‘fetch  successful‘);        console.log(res);    });

 

4:使用curl模块：(执行命令node app.js "http://www.baidu.com")

//app.js
var curl = require("curl");var u = "";if( require.main === module ) {    u = process.argv[2]};curl.get(u,function( data ){    console.log( arguments );});

 

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NODEJS中处理dom节点的方式(接口都和jq是统一的);

1:引用cheerio

var cheerio = require("cheerio");var html = "<html><body><div id=\"div1\">text</div></body></html>";var $ = cheerio.load(html);console.log( "html" );console.log( $.html() );console.log( "#div1————〉html" );console.log( $("#div1").html() );console.log( "#div1----〉text" );console.log( $("#div1").text() );

 

2:引用jquery

var $ = require("jquery");var $dom = $("<html><body><div id=\"div1\">text</div></body></html>");console.log( $dom.find("#div1").text() );

 

3:引用jsdom

var jsdom = require(‘jsdom‘);var curl = require("curl");var u = "https://github.com";if( require.main === module ) {    u = process.argv[2];};curl.get(u,function( arg0 , html ){     //jsdom相当于打开了一个页面，在这个页面里面运行js;    var document = jsdom.jsdom( html.body );    for(var a in html)        console.log(a);    var window = document.createWindow();    var script = document.createElement(‘script‘);    //script.src = http://www.mamicode.com/‘http://code.jquery.com/jquery-1.4.2.js‘;"http://127.0.0.1:81/js/jquery.min.js";    script.onload = function(){        console.log(1);        console.log( window.jQuery("body").text() );    };    document.head.appendChild( script );});

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文件保存的话直接用nodeJS中的fs模块:

var fs = require("fs");fs.appendFile(‘file-name‘, "text_text_text_text" ,function(err){    if(err)throw err;    console.log(‘done‘)});

 

NODE学习:利用nodeJS去抓网页的信息


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