dump iframe content

iframe.js

var page = require('webpage').create();
page.settings.loadImages = false;
page.onConsoleMessage = function(msg) { console.log(msg); };

page.onLoadFinished = function() {
    page.evaluate(function() {
        var getFrames = function(doc) {
            var frames = doc.querySelectorAll('iframe');
            for (var i = frames.length - 1; i >= 0; i--) {
                var fdoc = frames[i].contentWindow.document;
                console.log(fdoc.body.innerText);
            }
        };
        getFrames(document);
    });
    phantom.exit();
};

page.open(phantom.args[0]);