mpvue + Vant Weapp（第三方组件）小程序无法双向数据绑定（v-model）

<van-search
  placeholder="搜索 XXXX"
  use-action-slot
  :value="searchValue"
  @change="handleSearchChange"
  @click="handleSearch">
  <view
    slot="action"
    @click="handleSearch">搜索
  </view>
</van-search>

export default {
  data () {
    return {
      searchValue: ''
    }
  },
  methods: {
    handleSearchChange (event) {
      this.searchValue= event.mp.detail
    },
    handleSearch () {
      console.log(this.searchValue)
    }
  }
}