https://docs.microsoft.com/en-us/aspnet/ajax/cdn/overview
http://cdn.code.baidu.com/
以上地址无法访问,用以下域名访问对应的库
github地址:https://github.com/Clouda-team/baiducdnstatic
http://libs.baidu.com/jquery/1.9.0/jquery.js
<script src="//cdn.staticfile.org/jquery/1.8.3/jquery.min.js"></script>
<script>
if (!window.jQuery) {
var script = document.createElement('script');
script.src = "/js/jquery.min.js";
document.body.appendChild(script);
}
</script>
原文:https://www.cnblogs.com/yuzizsj/p/12179012.html