get url parameters

function get(key) {
    var searchParams = {},
        search = window.location.search.substring(1); // substring to remove the ?
 
    if (search) {
        search = search.split('&');
        for (var i in search) {
            if (search.hasOwnProperty(i) && i !== '') {
                var pair = search[i].split('=');
                pair[0] = decodeURIComponent(pair[0]);
                pair[1] = decodeURIComponent(pair[1]);
                searchParams[pair[0]] = pair[1];
            }
        }
    }
 
    if (key) {
        return searchParams[key];
    }
 
    return searchParams;