javascript - 使用所拍摄屏幕截图的功能的 Nightmare 类型结果

Question

嘿，我正在尝试制作一个 Nightmare 般的元素的屏幕截图，然后我想使用功能从此屏幕截图中提取文本，并在nightmare.type()中使用此结果。问题是当我使用nightmare.run()时，我收到一个错误，指出该屏幕截图不存在。我怎样才能解决这个问题？这是我的代码:

var Nightmare = require('nightmare');
var Screenshot = require('nightmare-screenshot');

var nightmare = new Nightmare();
nightmare.goto('website');
//Takes screenshot of element
nightmare.use(Screenshot.screenshotSelector('screenshot' + i + '.png', 'img[id="yw0"]'));
nightmare.type('input[id=AuthForm_login]', username);
nightmare.type('input[id=AuthForm_password]', password);

nightmare.type('input[id=upload]', image.decodeFile('screenshot' + i + '.png', function(err, result){
    //Returns Text from the Screenshot taken above!
    return result.text;
}));
nightmare.run();

当我删除行时:

nightmare.type('input[id=upload]', image.decodeFile('screenshot' + i + '.png', function(err, result){
        //Returns Text from the Screenshot taken above!
        return result.text;
    }));

一切正常，我得到了屏幕截图。

Answer 1

当 Nightmare 使用Phantomjs时，您可以那样做，尽管我发现下面的内容应该有所帮助。

归功于@fernandopasik，他说:

I found a way to do this, with the "use" method for executing plugins.

nightmare = new Nightmare(); urls.forEach(function (url) {
    nightmare.goto(url).screenshot(path).use(function () {
        console.log('finished one');
    }); });

nightmare.run(function () {
    console.log('finished all'); });

NightmareJS screenshot callback