Node calls Phantomjs-node to crawl complex pages

What is PHANTOMJS

PHANTOMJS The official website is said, ' Whole station test, screen capture, auto-paging, network monitoring ', is currently more popular to crawl complex, difficult to pass through the API or regular matching pages, such as the page is loaded asynchronously. PHANTOMJS is a full browser with no interface, so we can use it to simulate a real browser to access the page and then get the page. My point is to call Phantomjs in node to get the page.

Node communicates with PHANTOMJS

1. Command-line arguments can only be passed on when the PHANTOMJS is turned on, and there is nothing to do during the run.
2. The standard output can output data from PHANTOMJS to node, but it cannot be reversed.
3. HTTP PHANTOMJS sends an HTTP request to node, and then node returns data, but the request can only be sent by PHANTOMJS
4. WebSocket websocket Communication, can be two-way communication but the implementation of a little trouble.
5. Phantomjs-node is actually using WebSocket or HTTP communication, but after all, it is written by others we directly use the line, the disadvantage is a little dependent.

How to use Phantom-node

GitHub Address: Https://github.com/amir20/phantomjs-node

Here are just a few simple instructions for the detailed API see GitHub.

1. Installation

NPM Install Phantom

2. Module encapsulation (The following code is based on ES7, need to support Async/await,node version >7.0), more detailed use can view PHANTOMJS official documents

1' Use strict '2 3CONST PHANTOM = require (' Phantom ');4 5Let Getpic = Async (name) = = {6     //URL Path7Let URL = ' http:///' +name;8     //Create an instance9Const Instance =await Phantom.create ();Ten     //Create a page OneConst PAGE =await Instance.createpage (); A     //Setting page Parameters -Await Page.property (' viewportsize ', {width:1800, height:1200 } ); -     //open URL, return status (URL has transcoding, solve Chinese problem) theConst STATUS =await Page.open (encodeURI (URL)); - console.log (status); -     //delay wait page JS execution completed (Phantomjs just wait for all the resources on the page to load, not including the page JS execution time, so need to delay a period of time to wait for JS) -Await Latetime (500 ); +     //output page to current directory -Await Page.render (' ${name}--${date.now ()}.png '); +     //Destroying Instances A await Instance.exit (); at     //Return Data -     return' xxx '; - }; -  -Let Latetime = (time) = ={ -     return NewPromise (function(resolve,reject) { inSetTimeout (function(){ - resolve (); to }, time); +     } ); - } the //Exposed Interface *Module.exports = Getpic;

Node calls Phantomjs-node to crawl complex pages