omp-wx/pages/menu/broadcast/broadcast.wxml

<form bindsubmit="submit">
  <view class="btn-form-wapper">
    <van-button type="primary" custom-class="btn-form" form-type="submit">发送</van-button>
  </view>

  <view class="form-item">
    <view class="form-item-label">播报类型</view>
    <picker bindchange="bindTypeChange" value="{{typeIdx}}" range="{{typeList}}" range-key="name">
      <view class="picker">{{typeList[typeIdx].name}}</view>
    </picker>
  </view>

  <van-field name="news" label="内容" type="textarea" placeholder="请输入播报内容" autosize />

</form>