:: BASE_DOC ::

## API
### Cascader Props

name | type | default | description | required
-- | -- | -- | -- | --
close-btn | Boolean / Slot | true | \- | N
keys | Object | - | Typescript：`KeysType` | N
options | Array | [] | Typescript：`Array<CascaderOption>` | N
sub-titles | Array | [] | Typescript：`Array<string>` | N
theme | String | step | options：step/tab | N
title | String / Slot | - | \- | N
value | String / Number | null | \- | N
default-value | String / Number | undefined | uncontrolled property | N
visible | Boolean | false | \- | N

### Cascader Events

name | params | description
-- | -- | --
change | `(value: string \| number, selectedOptions: string[])` | `1.0.1`
close | `(trigger: TriggerSource)` | `1.0.1`。[see more ts definition](https://github.com/Tencent/tdesign-miniprogram/tree/develop/src/cascader/type.ts)。<br/>`type TriggerSource = 'overlay' \| 'close-btn' \| 'finish'`<br/>
pick | `(value: string \| number, index: number)` | `1.0.1`


### CSS Variables
The component provides the following CSS variables, which can be used to customize styles.
Name | Default Value | Description 
-- | -- | --
--td-cascader-active-color | @brand-color | - 
--td-cascader-border-color | @border-color | - 
--td-cascader-disabled-color | @font-gray-4 | - 
--td-cascader-options-height | 640rpx | - 
--td-cascader-options-title-color | @font-gray-3 | - 
--td-cascader-step-arrow-color | @font-gray-3 | - 
--td-cascader-step-dot-size | 16rpx | - 
--td-cascader-step-height | 88rpx | - 
--td-cascader-title-color | @font-gray-1 | - 
--td-cascder-title-font-size | 36rpx | -