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:: BASE_DOC ::
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## API
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### Cascader Props
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name | type | default | description | required
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-- | -- | -- | -- | --
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close-btn | Boolean / Slot | true | \- | N
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keys | Object | - | Typescript：`KeysType` | N
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options | Array | [] | Typescript：`Array<CascaderOption>` | N
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sub-titles | Array | [] | Typescript：`Array<string>` | N
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theme | String | step | options：step/tab | N
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title | String / Slot | - | \- | N
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value | String / Number | null | \- | N
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default-value | String / Number | undefined | uncontrolled property | N
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visible | Boolean | false | \- | N
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### Cascader Events
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name | params | description
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-- | -- | --
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change | `(value: string \| number, selectedOptions: string[])` | `1.0.1`
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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/>
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pick | `(value: string \| number, index: number)` | `1.0.1`
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