CDN：全称 内容分发网络优点：

比较快

节省自己服务器宽带压力和流量

推荐使用

jquery

http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js

http://cdn.bootcss.com/jquery/1.9.0/jquery.min.js

angular.js

http://apps.bdimg.com/libs/angular.js/1.4.0-beta.4/angular.min.js

animate.css

http://apps.bdimg.com/libs/animate.css/3.1.0/animate.min.css

zepto
http://apps.bdimg.com/libs/zepto/1.1.4/zepto.min.js

validator
http://apps.bdimg.com/libs/validator/1.0/validator.js

validform
http://apps.bdimg.com/libs/validform/5.3.2/validform.js

sizzle
http://apps.bdimg.com/libs/sizzle/1.10.19/sizzle.min.js

seajs
http://apps.bdimg.com/libs/seajs/2.3.0/sea.js

react
http://apps.bdimg.com/libs/react/0.10.0/react.min.js

impress.js
http://apps.bdimg.com/libs/impress.js/0.5.3/impress.min.js

html5shiv
http://apps.bdimg.com/libs/html5shiv/3.7/html5shiv.min.js

bootstrap

http://apps.bdimg.com/libs/bootstrap/3.3.4/js/bootstrap.min.js

zepto
http://cdn.bootcss.com/zepto/1.2.0/zepto.min.js

常用CDN