Viff 测试框架，它可以不同环境和浏览器下的 Web 页面的视觉差异。
示例代码：
var Viff = require('viff');var viff = new Viff('http://localhost:4444/wd/hub');
viff.takeScreenshot('firefox', 'http://localhost:3000', '/path1', function (bufferImg)
{ /* buffer of images */ });
// partial of web pages
viff.takeScreenshot('firefox', 'http://localhost:3000', ['path1', '#css-selecor'],
function (bufferPartialImg) {});
// responsive of web pages
function size(width) { return function (driver) {
driver.setWindowSize(width, 600 /* any height*/);
};
}
viff.takeScreenshot('firefox', 'http://localhost:3000', ['path', size(1024)],
function (bufferImg) {});
// Q promiseviff.takeScreenshot('firefox', 'http://localhost:3000', ['path', size(1024)])
.done(function (bufferImg)
{ /* generate image here */
})
.catch(function (err)
{ /* handle err here */
})
// using browser
stackviff = new Viff('http://hub.browserstack.com/wd/hub');
viff.takeScreenshot({ 'browserName' : 'iPhone', 'platform' : 'MAC',
'device' : 'iPhone 5', 'browserstack.user': /* your name */,
'browserstack.key': /* your key */},
'http://www.google.com', 'path1', function (bufferImg) {});
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