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webshot一款网页快照工具

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。

 

posted @ 2019-05-21 23:23  lightsong  阅读(1620)  评论(1)  编辑  收藏  举报
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