https://www.hottgenroth.de/js/utm.js

1//parse url
2function getParameterByName(name) {
3    name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]");
4    var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
5        results = regex.exec(location.search);
6    return results === null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
7}
8
9function getMainDomain() {
10    var matchArr = window.location.host.match(/[^\.]*\.[^\.]*$/);
11    if(matchArr){
12        return ("."+matchArr[0]);
13    }else{
14        return window.location.host;
15    }
16}
17
18var cDomain = getMainDomain();
19
20var utm_source = getParameterByName('utm_source');
21var utm_medium = getParameterByName('utm_medium');
22var utm_campaign = getParameterByName('utm_campaign');
23
24if (utm_source.length > 0) {
25    Cookies.set('utm_source', utm_source, { expires: 1, domain: cDomain });
26}
27if (utm_medium.length > 0) {
28    Cookies.set('utm_medium', utm_medium, { expires: 1 , domain: cDomain});
29}
30if (utm_campaign.length > 0) {
31    Cookies.set('utm_campaign', utm_campaign, { expires: 1 , domain: cDomain});
32}