display how many global variable is used by user (not system)

userGlobal

(function() {

	var keys = [];
	for (var k in window) {
		keys.push(k);
	}

	function isUserGloba(k) {
		for (var i = 0; i < keys.length; i++) {
			if (keys[i] === k) {
				return false;
			}
		}
		return true;
	}

	console.userGlobal = function() {
		var rtn = [];
		for (var k in window) {
			if (isUserGloba(k)) {
				rtn.push(k);
			}
		}
		return rtn;
	}
})();

put this script before all script, press f12 for debugger, and type console.userGlobal() to display all the global variables.