fix(form组件): 单元测试和源码数据类型不匹配的问题

pages/component/form/form.uvue

@@ -11,10 +11,10 @@
         <view class="title">性别</view>
         <radio-group name="gender" class="flex-row">
           <view class="group-item">
-            <radio :value="0" :checked="gender==0" /><text>男</text>
+            <radio :value="0" :checked="gender=='0'" /><text>男</text>
           </view>
           <view class="group-item">
-            <radio :value="1" :checked="gender==1" /><text>女</text>
+            <radio :value="1" :checked="gender=='1'" /><text>女</text>
           </view>
         </radio-group>
       </view>
@@ -56,7 +56,7 @@
     data() {
       return {
         nickname: '',
-        gender: 0,
+        gender: '0',
         age: 18,
         loves: ['0'],
         switch: true,