var page = require('webpage').create(); var system = require('system'); var args = system.args; var url = args[1] var viewPortSizeOfDevice = args[2] var fileName = args[3] console.log(viewPortSizeOfDevice); if (viewPortSizeOfDevice === "desktop") { page.viewportSize = { width: 1319, height: 222 } }; if (viewPortSizeOfDevice === "mobile") { page.viewportSize = { width: 375, height: 667 } }; page.open(url, function(status) { console.log("Status: " + status); if(status === "success") { page.render(fileName + '.png'); } phantom.exit(); });