从Google&ŧ039；的CDN获取jQuery库如果失败，则拉取本地版本

Posted 2021-02-24

Grab jQuery library from Google's CDN this way its faster, burns Google's bandwidth and not yours. Also users will have this cached if other sites are using it as well.

Downside of course is Google's servers do go down. This script will check if its available on Google's servers otherwise fall back to your local version.

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
<script>window.jQuery || document.write('<script src="js/libs/jquery-1.6.2.min.js"></script>')</script>