js document ready equivalent without jQuery

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function ready(callback) {
	if (document.readyState === 'complete' || document.readyState === 'interactive') {
		setTimeout(callback, 0);
	} else { // 'loading'
		var proxy = function(e) {
			if (document.readyState === 'complete' || document.readyState === 'interactive') {
				document.removeEventListener('readystatechange', proxy);
				callback();
			}
		};
		document.addEventListener('readystatechange', proxy);
	}
}

// Usage example:

ready(function(e) {
	console.log('Document is ready!');
});