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# Radio
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- category: Components
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- chinese: 单选框
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- order: 2
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---
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## 何时使用
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- 用于在多个备选项中选中单个状态。
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- 和 Select 的区别是，Radio 所有选项默认可见，方便用户在比较中选择，因此选项不宜过多。
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## API
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### Radio
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单选框。
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| 参数 | 说明 | 类型 | 必选值 | 默认值 |
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|----------------|------------------------------------------|------------|---------|--------|
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| checked | 指定当前是否选中 | boolean | false | false |
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| defaultChecked | 初始是否选中 | boolean | false | false |
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| value | 组合时根据此项判定checked | -- |true | null|
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### RadioGroup
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单选框组合；
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| 参数 | 说明 | 类型 | 必选值 | 默认值 |
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|----------------|------------------------------------------|------------|---------|--------|
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| onChange | 变化时回调函数，组合时必须 | Function(e:Event) | false | null |
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| value | 当前值 | | |
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| defaultValue | 初始值 | | |
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