iframe-get-script-value.js

var rawframe = document.createElement('iframe');
document.body.appendChild(rawframe)
var framedoc = rawframe.contentDocument;
if (!framedoc && rawframe.contentWindow) {
    framedoc = rawframe.contentWindow.document;
}
var script = document.createElement('script');
script.type = "text/javascript";
script.src = "http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js";
framedoc.body.appendChild(script);


script.onload = ()=>{console.log(document.querySelector('body > iframe:last-child').contentWindow.jQuery) }
// can get jQuery