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---
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category: Components
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chinese: 开关
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type: Form Controls
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english: Switch
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---
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开关选择器。
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## 何时使用
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- 需要表示开关状态/两种状态之间的切换时；
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- 和 `checkbox `的区别是，切换 `switch` 会直接触发状态改变，而 `checkbox` 一般用于状态标记，需要和提交操作配合。
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## API
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### Switch
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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 | Function(checked:boolean) | | |
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| checkedChildren | 选中时的内容 | React Node | | |
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| unCheckedChildren | 非选中时的内容 | React Node | | |
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| size | 开关大小 | string | 'default' or 'small' | 'default' |
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