实现思路：组件挂载后执行初始化操作，初始化添加事件监听器，当浏览器窗口大小发生变化时会调用这个函数handleResize 

 

<el-pagination v-model:current-page="currentPage" background :total="total" layout="prev, pager, next"
        class="pagination" :page-size="pageSize"   :pager-count="3"></el-pagination>

import { reactive, ref, computed, onMounted, onUnmounted } from 'vue'
const total = ref(30);

const pageSize = ref(10);

const currentPage = ref(1);


const pagedHonorList = computed(() => {

  const startIndex = (currentPage.value - 1) * pageSize.value;

  const endIndex = startIndex + pageSize.value;

  return honorList.slice(startIndex, endIndex);

});

// 动态计算宽度 当屏幕分辨率 =< 430px时候使用其他组件
const screenWidth = ref(window.innerWidth);

//处理窗口大小变化的逻辑
const handleResize = () => {
  screenWidth.value = window.innerWidth;
  if (screenWidth.value == 1024) {
    pageSize.value = 8

  } else if (screenWidth.value == 768) {
    pageSize.value = 6
  } else if (screenWidth.value <= 430) {
    pageSize.value = 4
  }
  // 将 pageSize 存储到本地存储
  localStorage.setItem('pageSize', pageSize.value.toString());

};
onMounted(() => {
  //动态计算宽
  // 在页面加载时尝试从本地存储中读取 pageSize
  if (localStorage.getItem('pageSize')) {
    const pageNumber = localStorage.getItem('pageSize')!
    pageSize.value = parseInt(pageNumber)
  }
//初始化添加事件监听器，当浏览器窗口大小发生变化时会调用这个函数handleResize 
  window.addEventListener('resize', handleResize);
 
});