#### 拖拽上传
把文件拖入指定区域，完成上传，同样支持点击上传。
设置 `multiple` 后，在 `IE10+` 可以一次上传多个文件。
#### Drag and Drop
Classic mode. File selection dialog pops up when upload button is clicked.
```html
Click or drag file to this area to upload
Support for a single or bulk upload. Strictly prohibit from uploading company data or other band files