Javascript $_GET() - similar in nature to PHP $_GET[]

get_function.js

/**
 * Description: Gets a URL parameter value. Similar to PHP $_GET
 * @param {string} param 
 */
function $_GET(param) {
    var vars = {};
    window.location.href.replace(location.hash, '').replace(/[?&]+([^=&]+)=?([^&]*)?/gi, // regexp
        function (m, key, value) { // callback
            vars[key] = value !== undefined ? value : '';
        });
    if (param) {
        return vars[param] ? vars[param] : null;
    }
    return vars;
}