版本：2.1.12
- https://cdn.bootcdn.net/ajax/libs/lovefield/2.1.12/lovefield.es6.js
- https://cdn.bootcdn.net/ajax/libs/lovefield/2.1.12/lovefield.externs.js
- https://cdn.bootcdn.net/ajax/libs/lovefield/2.1.12/lovefield.js
- https://cdn.bootcdn.net/ajax/libs/lovefield/2.1.12/lovefield.min.js