vue vant rate评分组件无法点击取消归零功能处理

// 通过监听点击事件去判断是否触发change事件，如果没有则说明数据没变化
<van-rate v-model="modelValue" :disabled="!conf.isEditText" disabled-color="rgba(0,86,255,0.5)" :allow-half="conf['allow-half']" color="#0056FF" @change="changeRate" @click.native="changeValue" />

  methods: {

    changeRate() {

      this.validClick = true

      this.timer && clearTimeout(this.timer)

      this.timer = null

    },  

    changeValue() {

      if(this.validClick) {

        this.validClick = false

        return

      }

      this.timer = setTimeout(() => {

        this.modelValue = undefined

      }, 80)

    }

  }