版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/file-upload-with-preview/6.1.2/index.iife.js
- https://cdn.bootcdn.net/ajax/libs/file-upload-with-preview/6.1.2/index.iife.min.js
- https://cdn.bootcdn.net/ajax/libs/file-upload-with-preview/6.1.2/index.js
- https://cdn.bootcdn.net/ajax/libs/file-upload-with-preview/6.1.2/index.min.js
- https://cdn.bootcdn.net/ajax/libs/file-upload-with-preview/6.1.2/style.css
- https://cdn.bootcdn.net/ajax/libs/file-upload-with-preview/6.1.2/style.min.css