版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/clamp-js/0.7.0/clamp.js
- https://cdn.bootcdn.net/ajax/libs/clamp-js/0.7.0/clamp.min.js
Clamps (ie. cuts off) an HTML element's content by adding ellipsis to it if the content inside is too long.