feat(CheckboxGroup): add direction prop

src/form/demo/FieldType.vue

@@ -1,12 +1,19 @@
 <template>
   <demo-block :title="$t('fieldType')">
     <van-form @submit="onSubmit">
+      <van-field name="switch" :label="$t('switch')">
+        <van-switch v-model="switchChecked" slot="input" size="24" />
+      </van-field>
+
       <van-field name="checkbox" :label="$t('checkbox')">
         <van-checkbox v-model="checkbox" slot="input" shape="square" />
       </van-field>
 
-      <van-field name="switch" :label="$t('switch')">
-        <van-switch v-model="switchChecked" slot="input" size="24" />
+      <van-field name="radio" :label="$t('radio')">
+        <van-radio-group v-model="radio" direction="horizontal" slot="input">
+          <van-radio name="1" class="demo-radio">{{ $t('radio') }} 1</van-radio>
+          <van-radio name="2">{{ $t('radio') }} 2</van-radio>
+        </van-radio-group>
       </van-field>
 
       <van-field name="rate" :label="$t('rate')">
@@ -33,6 +40,7 @@ export default {
   i18n: {
     'zh-CN': {
       rate: '评分',
+      radio: '单选框',
       submit: '提交',
       switch: '开关',
       slider: '滑块',
@@ -43,6 +51,7 @@ export default {
     },
     'en-US': {
       rate: 'Rate',
+      radio: 'Radio',
       submit: 'Submit',
       switch: 'Switch',
       slider: 'Slider',
@@ -56,6 +65,7 @@ export default {
   data() {
     return {
       rate: 3,
+      radio: '1',
       slider: 50,
       stepper: 1,
       checkbox: false,