webshot
https://github.com/brenden/node-webshot
Webshot provides a simple API for taking webpage screenshots. The module is a light wrapper around PhantomJS, which utilizes WebKit to perform the page rendering.
例子
A simple url example:
var webshot = require('webshot'); webshot('google.com', 'google.png', function(err) { // screenshot now saved to google.png });An html example:
var webshot = require('webshot'); webshot('<html><body>Hello World</body></html>', 'hello_world.png', {siteType:'html'}, function(err) { // screenshot now saved to hello_world.png });Alternately, the screenshot can be streamed back to the caller:
var webshot = require('webshot'); var fs = require('fs'); var renderStream = webshot('google.com'); var file = fs.createWriteStream('google.png', {encoding: 'binary'}); renderStream.on('data', function(data) { file.write(data.toString('binary'), 'binary'); });An example showing how to take a screenshot of a site's mobile version:
var webshot = require('webshot'); var options = { screenSize: { width: 320 , height: 480 } , shotSize: { width: 320 , height: 'all' } , userAgent: 'Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_2 like Mac OS X; en-us)' + ' AppleWebKit/531.21.20 (KHTML, like Gecko) Mobile/7B298g' }; webshot('flickr.com', 'flickr.jpeg', options, function(err) { // screenshot now saved to flickr.jpeg });
作用
给网页拍照， 生成网页照片图， 然后使用图形化比对工具检测图形变化， 进而检测页面变化。
用于图形并茂的方式， 给网页做介绍， 给用户更好的按照图形的感觉，记忆网站的使用场景。
例如， 用户看到网页截图中有一个搜索框， 就知道是搜索引擎。