版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/jRespond/1.0.0/js/jRespond.js
- https://cdn.bootcdn.net/ajax/libs/jRespond/1.0.0/js/jRespond.min.js
- https://cdn.bootcdn.net/ajax/libs/jRespond/1.0.0/js/util.js
jRespond is a simple way to globally manage javascript on responsive websites.