Function that generates element selector hash. Example: div#foo.bar.baz

selhash.js

function selhash(element) {
	if (!element || !element.nodeName) {
		return Object.prototype.toString.call(element)
				.match(/^\[object (\w+)\]$/i)[1]
				.toLowerCase() + ':' + element;
	}
	var parts = [];
	parts.push(element.nodeName.toLowerCase());
	if (element.id) {
		parts.push('#' + element.id);
	}
	if (element.className) {
		parts.push('.' + element.className.trim().split(/ +/).join('.'));
	}
	return parts.join('');
}

usage.html

<div id="foo" class="bar baz"></div>

<script>
var element = document.querySelector('#foo');

selhash(element); // div#foo.bar.baz
selhash(5);       // number:5
selhash(window);  // global:[object Window]
selhash([1, 2]);  // array:1,2
</script>