index.html

<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
<a href="asdf?foo=bar">clickme</a>
<a href="asdf?doo=gar">clickme2</a>
<script>
var $as = document.querySelectorAll('a');

[].forEach.call($as, function ($a) {
	$($a).on('click', post);
});

function post(e) {
	e.preventDefault();
	var $a = e.target;
	var data = query_string_to_object($a.href.split('?')[1]);
	$.post($a.href, data, function (data) {
		document.body.innerHTML = data;
	});
}

function query_string_to_object(str) {
	if (typeof str !== 'string') {
		return {};
	}

	str = str.trim().replace(/^(\?|#)/, '');

	if (!str) {
		return {};
	}

	return str.trim().split('&').reduce(function (ret, param) {
		var parts = param.replace(/\+/g, ' ').split('=');
		var key = parts[0];
		var val = parts[1];

		key = decodeURIComponent(key);
		// missing `=` should be `null`:
		// http://w3.org/TR/2012/WD-url-20120524/#collect-url-parameters
		val = val === undefined ? null : decodeURIComponent(val);

		if (!ret.hasOwnProperty(key)) {
			ret[key] = val;
		} else if (Array.isArray(ret[key])) {
			ret[key].push(val);
		} else {
			ret[key] = [ret[key], val];
		}

		return ret;
	}, {});
};
</script>