get url parameter

parseQueryString ~ get url parameter

function parseQueryString () {
    var str = window.location.search,
        objURL = {},
        isArray = _.isArray,
        first;

    str.replace(
        new RegExp('([^?=&]+)(=([^&]*))?', 'g'),
        function ($0, $1, $2, $3) {
            if (objURL[$1] && !isArray(objURL[$1])) {
                first = objURL[$1];
                objURL[$1] = [first, $3];
            } else if (objURL[$1] && isArray(objURL[$1])) {
                objURL[$1].push($3);
            } else {
                objURL[$1] = $3;
            }
        }
    );

    return objURL;
}