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# Radio
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- category: Components
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- chinese: 单选框
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---
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单选框。
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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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| 参数 | 说明 | 类型 | 可选值 |默认值 |
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|-----------|------------------------------------------|------------|-------|--------|
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| checked | 指定当前是否选中 | boolean | | false |
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| defaultChecked | 初始是否选中 | boolean | | false |
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| onChange | 变化时回调函数，组合时必须 | Function(e:Event) | | |
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| value | value参数，组合时根据此项判定checked | -- | | | |
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####组合使用：
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以value值来决定自身的checked，
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gruop里需一个做全局checked的参数
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`getInitialState() {
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return {
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r: 'a'
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}
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}`
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在自身checked上判断`this.state.r === 'a'`；
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回调接口里
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`this.setState({
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r: e.target.value
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})`
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