[Improvement] Reorganize document (#1066)
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## Radio 单选框
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### 使用指南
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``` javascript
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import { RadioGroup, Radio } from 'vant';
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Vue.use(RadioGroup);
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Vue.use(Radio);
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```
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### 代码演示
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#### 基础用法
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通过`v-model`绑定值当前选中项的 name
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```html
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<van-radio-group v-model="radio">
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<van-radio name="1">单选框 1</van-radio>
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<van-radio name="2">单选框 2</van-radio>
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</van-radio-group>
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```
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```javascript
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export default {
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data() {
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return {
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radio: '1'
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}
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}
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};
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```
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#### 禁用状态
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通过`disabled`属性禁止选项切换,在`van-radio`上设置`diabled`可以禁用单个选项
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```html
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<van-radio-group v-model="radio" disabled>
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<van-radio name="1">单选框 1</van-radio>
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<van-radio name="2">单选框 2</van-radio>
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</van-radio-group>
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```
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#### 与 Cell 组件一起使用
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此时你需要再引入`Cell`和`CellGroup`组件。
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```html
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<van-radio-group v-model="radio">
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<van-cell-group>
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<van-cell :title="单选框 1" clickable @click="radio = '1'">
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<van-radio name="1" />
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</van-cell>
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<van-cell :title="单选框 2" clickable @click="radio = '2'">
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<van-radio name="2" />
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</van-cell>
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</van-cell-group>
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</van-radio-group>
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```
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### Radio API
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| 参数 | 说明 | 类型 | 默认值 |
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|-----------|-----------|-----------|-------------|
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| name | 唯一标识符 | 任意类型 | - |
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| disabled | 是否为禁用状态 | `Boolean` | `false` |
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### RadioGroup API
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| 参数 | 说明 | 类型 | 默认值 |
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|-----------|-----------|-----------|-------------|
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| v-model | 当前选中项的 name | 任意类型 | - |
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| disabled | 是否禁用所有单选框 | `Boolean` | `false` |
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### RadioGroup Event
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| 事件名称 | 说明 | 回调参数 |
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|-----------|-----------|-----------|
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| change | 当绑定值变化时触发的事件 | 当前选中项的 name |
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