版本：2.6.11
- https://cdn.bootcdn.net/ajax/libs/core-js/2.6.11/core.js
- https://cdn.bootcdn.net/ajax/libs/core-js/2.6.11/core.min.js
- https://cdn.bootcdn.net/ajax/libs/core-js/2.6.11/library.js
- https://cdn.bootcdn.net/ajax/libs/core-js/2.6.11/library.min.js
- https://cdn.bootcdn.net/ajax/libs/core-js/2.6.11/shim.js
- https://cdn.bootcdn.net/ajax/libs/core-js/2.6.11/shim.min.js