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copied!<p>Why extend jQuery? What would be the benefit of extending jQuery vs just having a global function?</p> <pre><code>function qs(key) { key = key.replace(/[*+?^$.\[\]{}()|\\\/]/g, "\\$&"); // escape RegEx meta chars var match = location.search.match(new RegExp("[?&]"+key+"=([^&]+)(&|$)")); return match && decodeURIComponent(match[1].replace(/\+/g, " ")); } </code></pre> <p><a href="http://jsfiddle.net/gilly3/sgxcL/">http://jsfiddle.net/gilly3/sgxcL/</a></p> <p>An alternative approach would be to parse the entire query string and store the values in an object for later use. This approach doesn't require a regular expression and extends the <code>window.location</code> object (but, could just as easily use a global variable):</p> <pre><code>location.queryString = {}; location.search.substr(1).split("&").forEach(function (pair) { if (pair === "") return; var parts = pair.split("="); location.queryString[parts[0]] = parts[1] && decodeURIComponent(parts[1].replace(/\+/g, " ")); }); </code></pre> <p><a href="http://jsfiddle.net/gilly3/YnCeu/">http://jsfiddle.net/gilly3/YnCeu/</a></p> <p>This version also makes use of <code>Array.forEach()</code>, which is unavailable natively in IE7 and IE8. It can be added by using <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/forEach#Compatibility">the implementation at MDN</a>, or you can use jQuery's <a href="http://api.jquery.com/jquery.each/"><code>$.each()</code></a> instead.</p>

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