Vue3反应值未按预期更新

Question

我有这个.ts文件：

import { reactive, toRefs } from 'vue'

export const TitleComponent = () => {
  const obj = reactive({
    title: "This should be reactive"
  }) 

  const updateObj = () => {
    obj.title = 'This is now different'
  }
  return {...toRefs(obj), updateObj }

}

然后将其导入到显示它的vue组件中

<template>
  <h1>{{ title }}</h1>
</template>
import { defineComponent } from 'vue'
import { TitleComponent } from 'some/place'

export default defineComponent({
  const { title } = TitleComponent()
  return { title }
})

然后，我在运行该方法的另一个组件中使用函数updateObj。但是它不会更新title值。怎么回事？

<template>
  <button @click="updateObj">Click Me</button>
</template>

import { defineComponent } from 'vue'
import { TitleComponent } from 'some/place'

export default defineComponent({
  const { updateObj } = TitleComponent()
  return { updateObj}
})

Answer 1

将obj移出export const TitleComponent = () => {}。

import { reactive, toRefs } from 'vue';

const obj = reactive({
  title: 'This should be reactive'
});

export const TitleComponent = () => {
  const updateObj = () => {
    obj.title = 'This is now different'
  };

  return { ...toRefs(obj), updateObj };
}

当它在内部并且您导入/调用TitleComponent()时，它每次都会创建一个新的obj实例。