這篇文章主要介紹了nodejs通過phantomjs實現下載網頁的方法，有需要的小伙伴可以參考下。
功能其實很見簡單，通過 phantomjs.exe 采集 url 加載的資源,通過子進程的方式，啟動nodejs 加載所有的資源，對於css的資源，匹配css內容，下載裡面的url資源
當然功能還是很簡單的，在響應式設計和異步加載的情況下，還是有很多資源沒有能夠下載，需要根據實際情況處理下
首先當然是下載 nodejs 和 phantomjs
下面是 phantomjs.exe 執行的 down.js
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 var page = require('webpage').create(), system = require('system'); var spawn = require("child_process").spawn if (system.args.length === 1) { console.log('Usage: netsniff.js <some URL>'); phantom.exit(1); } else { var urls = []; page.address = system.args[1]; page.onResourceReceived = function (res) { if (res.stage === 'start') { urls.push(res.url); } }; page.open(page.address, function (status) { var har; if (status !== 'success') { console.log('FAIL to load the address'); phantom.exit(1); } else { console.log('down resource ' + urls.length + ' urls.'); var child = spawn("node", ["--harmony", "downHtml.js", urls.join(',')]) child.stdout.on("data", function (data) { console.log(data); }) child.stderr.on("data", function (data) { console.log(data); }) child.on("exit", function (code) { phantom.exit(); }) } }); }下面是對應的node運行的 downHtml.js
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 "use strict"; var fs = require('fs'); var http = require('http'); var path = require('path'); var r_url = require('url'); var dirCache = {};//緩存減少判斷 function makedir (pathStr, callback) { if (dirCache[pathStr] == 1) { callback(); } else { fs.exists(pathStr, function (exists) { if (exists == true) { dirCache[pathStr] == 1; callback(); } else { makedir(path.dirname(pathStr), function () { fs.mkdir(pathStr, function () { dirCache[pathStr] == 1; callback(); }) }); } }) } }; var reg = /[:,]s*url(['"]?.*?(1))/g var reg2 = /((['"]?)(.*?)(1))/ var isDownMap = {}; var downImgFromCss = function (URL) { http.get(URL, function(res) { //console.log(path.resolve(process.cwd(), 'index.min.css')) //res.pipe(fs.createWriteStream(path.resolve(process.cwd(), 'index.min.css'))); var body = ""; res.setEncoding('utf8'); res.on('data', function (chunk) { body += chunk; }); res.on('end', function () { var match = body.match(reg); for (var i = 0, len = match.length; i < len; i++){ var m = match[i].match(reg2); if (m && m[2]) { var url = m[2]; let imgUrl = r_url.resolve(URL, url); if (!isDownMap[imgUrl]) { var uo = r_url.parse(imgUrl); let filepath = CWD + '/' + uo.hostname + uo.pathname; makedir(path.dirname(filepath), function () { http.get(imgUrl, function (res) { res.pipe(fs.createWriteStream(filepath)); }) }) isDownMap[imgUrl] = 1; } } } }); }); } var URLS = process.argv[2].split(','); var CWD = process.cwd(); //下載資源 URLS.forEach(function (URL) { var uo = r_url.parse(URL); var filepath; if (uo.pathname == '/' || uo.pathname == '') { filepath = CWD + '/' + uo.hostname + '/index.html'; } else { filepath = CWD + '/' + uo.hostname + uo.pathname; } makedir(path.dirname(filepath), function () { http.get(URL, function (res) { if (URL.indexOf('.css') != -1 || (res.headers["content-type"] && res.headers["content-type"].indexOf('text/css')!= -1)) { console.log('down images form css file:' + URL + '.'); downImgFromCss(URL); } res.pipe(fs.createWriteStream(filepath)); }) }); });down.js downHtml.js 放在同一個文件夾下 通過下列 cmd 運行
D:phantomjs-2.0.0-windowsbinphantomjs.exe down.js http://www.youku.com/
以上所述就是本文的全部內容了，希望大家能夠喜歡。
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