[stackoverflow] Erase/reset DOM and global variables with JavaScript (2017/01/24) [2019/12/25]
(function() {
var originalProperties = Object.getOwnPropertyNames(window); //global variables, before dom is loaded
var injectDOM = function() {
document.removeEventListener('DOMContentLoaded', injectDOM);
//trying to erase global variables set by remote resource, if any. Is there a better way?
var newProperties = Object.getOwnPropertyNames(window);
var difference = newProperties.filter(x => originalProperties.indexOf(x) == -1);
for (i = 0; i < newVariables.length; i++) {
if (window.hasOwnProperty(newVariables[i])) {
window[newVariables[i]] = null;
delete window[newVariables[i]]
//some variables still stay, delete return false, however they are nulled
//but is there a better way to do that and what about possible attached event listeners?
}
}
var html = '';
html += '';
html += '<!DOCTYPE htm>';
html += '<html>';
html += '<head>';
//html += '<script>alert("test");</script>';
html += '</head>';
html += '<body>';
html += 'hello world';
html += '</body>';
html += '</html'>;
document.write(html);
}
document.addEventListener('DOMContentLoaded', injectDOM);
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