project init & fix ui
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miniprogram_npm/tdesign-miniprogram/cascader/README.md
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miniprogram_npm/tdesign-miniprogram/cascader/README.md
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---
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title: Cascader 级联选择器
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description: 级联选择器适用于有清晰层级结构的数据集合,用户可以通过逐级查看并选择。
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spline: form
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isComponent: true
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---
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<div style="background: #ecf2fe; display: flex; align-items: center; line-height: 20px; padding: 14px 24px; border-radius: 3px; color: #555a65">
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<svg fill="none" viewBox="0 0 16 16" width="16px" height="16px" style="margin-right: 5px">
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<path fill="#0052d9" d="M8 15A7 7 0 108 1a7 7 0 000 14zM7.4 4h1.2v1.2H7.4V4zm.1 2.5h1V12h-1V6.5z" fillOpacity="0.9"></path>
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</svg>
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该组件于 0.23.0 版本上线,请留意版本。
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</div>
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## 引入
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全局引入,在 miniprogram 根目录下的`app.json`中配置,局部引入,在需要引入的页面或组件的`index.json`中配置。
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```json
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"usingComponents": {
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"t-cascader": "tdesign-miniprogram/cascader/cascader"
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}
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```
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## 代码演示
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### 基础用法
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{{ base }}
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### 选项卡风格
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{{ theme-tab }}
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### 进阶
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#### 带初始值
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{{ with-value }}
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#### 自定义 keys
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{{ keys }}
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#### 使用次级标题
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{{ with-title }}
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## API
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### Cascader Props
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名称 | 类型 | 默认值 | 说明 | 必传
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-- | -- | -- | -- | --
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close-btn | Boolean / Slot | true | 关闭按钮 | N
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keys | Object | - | 用来定义 value / label 在 `options` 中对应的字段别名。TS 类型:`KeysType` | N
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custom-style `v0.25.0` | String | - | 自定义组件样式 | N
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options | Array | [] | 可选项数据源。TS 类型:`Array<CascaderOption>` | N
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sub-titles | Array | [] | 每级展示的次标题。TS 类型:`Array<string>` | N
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theme | String | 'step' | 展示风格。可选项:step/tab | N
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title | String / Slot | - | 标题 | N
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value | String / Number | null | 选项值 | N
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default-value | String / Number | undefined | 选项值。非受控属性 | N
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visible | Boolean | false | 是否展示 | N
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