google统计js不能加载解决

由于统计域名无法访问，导致网页错乱，可以将统计js添加到页面加载完成后再加载，就不会影响页面了。

1. <!-- Global site tag (gtag.js) - Google Analytics -->
2. <!-- Modified By Ricardo (Tongtong) Liu -->
3. <!-- <script async src="https://www.googletagmanager.com/gtag/js?id=UA-XXXXX-Y"></script> -->
4. <script>
5. window.dataLayer = window.dataLayer || [];
6. function gtag(){dataLayer.push(arguments);}
7. gtag('js', new Date());
8. gtag('config', 'UA-XXXXX-Y');
10. window.addEventListener('load', function(){
11. var s = document.createElement('script');
12. s.src = "https://www.googletagmanager.com/gtag/js?id=UA-XXXXX-Y";
13. document.body.appendChild(s);
14. });
15. </script>