需求：后端把所有数据都返给前端，前端进行分页渲染。

实现思路：先把数据存储到一个大数组中，然后调用方法进行切割。主要使用数组的slice方法

所有代码：

html

<template>
  <div style="padding: 20px">
    <el-table :data="tableData">
      <el-table-column type="selection" width="55" />
      <el-table-column prop="username" label="用户名" show-overflow-tooltip />
      <el-table-column prop="firstName" label="姓名" show-overflow-tooltip />
      <el-table-column prop="email" label="邮箱" show-overflow-tooltip />
    </el-table>
    <!-- 分页器 -->
    <div class="pagination">
      <el-pagination
        v-model:current-page="pagination.pageNum"
        v-model:page-size="pagination.pageSize"
        :page-sizes="[10, 20, 50, 100]"
        layout="total,  prev, pager, next,sizes, jumper"
        :total="pagination.total"
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
      />
    </div>
  </div>
</template>

js

<script setup lang="ts">
import { ref, reactive } from "vue";

let tableData = ref<any>([]); // 表格数据
let allList = reactive<any>([]);
//分页器
const pagination = reactive<any>({
  pageNum: 1,
  pageSize: 10,
  total: 0,
});

// 前端分页-切割数据
const paging = () => {
  // 起始位置 = (当前页 - 1) x 每页的大小
  const start = (pagination.pageNum - 1) * pagination.pageSize;
  // 结束位置 = 当前页 x 每页的大小
  const end = pagination.pageNum * pagination.pageSize;
  tableData.value = allList.slice(start, end);
};

// 获取列表数据
const getList = async () => {
  // 接口请求
  allList = [
    {id:1, username: "admin1", firstName: "管理员", email: "123456@163.com" },
    {id:2, username: "admin2", firstName: "管理员", email: "123456@163.com" },
    {id:3, username: "admin3", firstName: "管理员", email: "123456@163.com" },
    {id:4, username: "admin4", firstName: "管理员", email: "123456@163.com" },
    {id:5, username: "admin5", firstName: "管理员", email: "123456@163.com" },
    {id:6, username: "admin6", firstName: "管理员", email: "123456@163.com" },
    {id:7, username: "admin7", firstName: "管理员", email: "123456@163.com" },
    {id:8, username: "admin8", firstName: "管理员", email: "123456@163.com" },
    {id:9, username: "admin9", firstName: "管理员", email: "123456@163.com" },
    {id:10, username: "admin10", firstName: "管理员", email: "123456@163.com" },
    {id:11, username: "admin11", firstName: "管理员", email: "123456@163.com" },
    {id:12, username: "admin12", firstName: "管理员", email: "123456@163.com" },
    {id:13, username: "admin13", firstName: "管理员", email: "123456@163.com" },
    {id:14, username: "admin14", firstName: "管理员", email: "123456@163.com" },
    {id:15, username: "admin15", firstName: "管理员", email: "123456@163.com" },
    {id:16, username: "admin16", firstName: "管理员", email: "123456@163.com" },
    {id:17, username: "admin17", firstName: "管理员", email: "123456@163.com" },
    {id:18, username: "admin18", firstName: "管理员", email: "123456@163.com" },
  ];
  pagination.total = allList.length;
  paging();
};
getList();

// 分页事件
const handleSizeChange = (val: number) => {
  pagination.page = 1;
  pagination.limit = val;
  getList();
};
const handleCurrentChange = (val: number) => {
  pagination.page = val;
  getList();
};
</script>