vue.js中的Watcher不会收到值

Question

Im正在使用观察者来更新组件Persons.vue中的值，一旦数组Im从App.vue传递到Persons.vue作为道具变化。我可以使用选项列表更新道具时，它可以正常工作并进行更新。但是，一旦Im使用日期选择器设置新日期，保存在proppersonData中的数组就会在控制台日志中正确更新，但在观察程序中不会收到。

解决此问题的任何提示都非常感激！

这是基于更大应用程序的虚拟代码设置，但希望您能解决此问题。

App.vue

<template>
  <div id="app">
    <select @change="person($event)">
      <option :value="selectionOne">One</option>
      <option :value="selectionTwo">Two</option>
    </select>
    <flat-pickr v-model="initDate" :config="config" @on-change="changeTime"></flat-pickr>
  </div>
</template>

如果我先更新人员，则将值正确发送给观察者，但是如果此后我通过更改日期来运行changeTime函数，则不会将值发送给观察者。>

  data() {
    return {
      selected: "selectionOne",
      selectionOne: "selectionOne",
      selectionTwo: "selectionTwo",
      personOne: [{ firstName: "XX" }, { born: "XXXX" }],
      personTwo: [{ firstName: "YY" }, { born: "YYYY" }],
      personData: []
    };
  },
  created() {
    this.personData = [{ firstName: "XX" }, { born: "XXXX" }];
  },

  methods: {
    // if I start with updating the person the value is sent to the watcher correctly
    person(e) {
      this.selected = e;
      this.updateSensorvalues(e);
    },
    // but if I after that is running the changeTime function by changing the date the value is not sent to the watcher
    changeTime(selectedDates) {
      this.born = this.timeFormatter(selectedDates[0]);
      this.updateNames(this.selected);
    },

    updateNames(e) {
      this.selected = e;
      let selection = e.target.value.split(",");
      if (selection == "selectionOne") {
        this.personData = this.personOne;
        // updating the second position with new born object
        this.personData[1] = { born: this.born };
      }
      if (selection == "selectionTwo") {
        this.personData = this.personTwo;
        this.personData[1] = { born: this.born };
      }
      console.log(this.personData)
    }
  }
};
Persons.vue

export default {
  name: "Persons",
  props: {
    personData: {
      type: Array
    }
  },

  watch: {
    personData: {
      deep: true,
      immediate: true,
      handler(newValue) {
        try {
          console.log("newValue", newValue);
        } catch (err) {
          console.log("no data yet ...");
        }
      }
    }
  }
};
</script>

I会在使用vue时使用观察程序来更新组件Impersons中从App.vue传递到Persons.vue的数组Im，以更新组件Persons.vue中的值。当Im ...