版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/bttrlazyloading/1.0.8/bttrlazyloading.css
- https://cdn.bootcdn.net/ajax/libs/bttrlazyloading/1.0.8/bttrlazyloading.min.css
- https://cdn.bootcdn.net/ajax/libs/bttrlazyloading/1.0.8/jquery.bttrlazyloading.js
- https://cdn.bootcdn.net/ajax/libs/bttrlazyloading/1.0.8/jquery.bttrlazyloading.min.js