JS Website debugger

js-web-debug.js

(function() {
	var scriptURI = prompt('Enter your script','https://gist.githubusercontent.com/NeoTech/6778e791e297151dd4a5/raw/b4604119b690d797ae350e0f6ef6eaa5775b07f1/screenshot.js');
	var callback = prompt('Enter a Callback', "(function() { console.log('Script loaded'); })");
	var getScript = (function getScript(url,success) {
		var head=document.getElementsByTagName('body')[0],done=false;
		var script=document.createElement('script');
		script.src=url;
		script.onload=script.onreadystatechange=function(){
			if(!done && (!this.readyState || this.readyState=='loaded' || this.readyState=='complete')) {
				done=true;
				if(typeof(success) === 'function') { success(); }
			}
		};
		head.appendChild(script);
	});
	callback = eval(callback);
	getScript(scriptURI,callback);
})();