In Browser URL parser

url.js

/**
 * Parse URLs in a Browser environment.
 *
 * Ussage: 
 * 1) var hostname = $url('https://duzun.me/playground', 'hostname');
 * 
 * 2) var a = $url('https://duzun.me/playground?some=param');
 *    a.protocol = 'http:';
 *    var hrefSecured = a.href;
 */
function $url(href, part, doc) {
    var a = url.a
    ,   odoc = document
    ;
    if (doc && doc !== odoc) {
        a = doc.createElement('A');
    }
    else {
        doc = odoc;
        if(!a) url.a = a = doc.createElement('A');
    }

    if (href != null) {
        if (href === '') href = doc.location.href; // IE interprets '' as base_url
        a.href = href;
    }
    if (part === 'hash') {
        if (part = a[part])
            part = part.replace(/.*(?=#[^\s]*$)/, ''); // strip for ie7
        return part;
    }
    return part ? a[part] : a;
} ;

Alternatively use new URL() in newer browsers or a lib like URL.js