问查看Vue 3全局变量以了解更改

EN

import {  ref } from "vue";

const currentPage=ref('test')

export default function usePagination(){

  function setCurrentPage(val:string){
      currentPage.value=val;
 }

return {currentPage, setCurrentPage}
}

import usePagination from './usePagination'
...
setup(){
  const { setCurrentPage} =usePagination();

  // then use setCurrentPage to update the page

}

import usePagination from './usePagination'
...
setup(){
  const { currentPage} =usePagination();

  // now you could receive the changes made in the other component.
  return {
       currentPage // expose it to the template 
   }
}

import { ref } from 'vue';
app.config.globalProperties.$currentPage = ref("Page 1");

<template>
    <div>{{ currentPage }}</div>
</template>
<script>
export default {
  name: "App",
  data(){
     return {
         currentPage: "test1"
     }
  },
  mounted() {
    this.updateCurrentPage()
  },
  watch: {
    '$currentPage.value':{
      handler: function () {
          this.updateCurrentPage()
      }, deep: true }
  },
  methods: {
    updateCurrentPage(){
      this.currentPage = this.$currentPage.value
    }
  }
}
</script>

<template>
   <div>
      <button @click="changePage()">changePage</button>
   </div>
</template>
<script>
export default {
  name: 'DeepNestedComponent',
  data(){
    return {
      pageCount: 0
    }
  },
  methods:{
    changePage(){
      this.pageCount    = this.pageCount + 1
      const pageValue   = `Page ${this.pageCount}`
      this.$currentPage = pageValue
    }
  }
}
</script>

<script>
  import {defineComponent, ref, provide} from 'vue';
  import Parent from "./Parent.vue";
  
  export default defineComponent({
    setup (){
      const msg = ref("Hello World");
      provide("message", msg);
      return {msg};
    },
    
    components: {
      Parent
    }
  });
</script>