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js 实现分页

2026-04-03 18:53:02JavaScript

分页实现方法

在JavaScript中实现分页功能通常涉及前端数据处理或与后端API交互。以下是几种常见的实现方式：

纯前端分页（适用于数据量较小的情况）

将全部数据加载到前端，通过JavaScript进行分页处理：

const data = [...]; // 假设这是全部数据
const pageSize = 10;
let currentPage = 1;

function paginate(items, pageNumber, pageSize) {
  const startIndex = (pageNumber - 1) * pageSize;
  return items.slice(startIndex, startIndex + pageSize);
}

const paginatedData = paginate(data, currentPage, pageSize);

后端API分页（推荐方式）

与后端配合实现分页，通常需要传递页码和每页数量参数：

async function fetchPaginatedData(page, size) {
  const response = await fetch(`/api/data?page=${page}&size=${size}`);
  return response.json();
}

// 使用示例
fetchPaginatedData(1, 10).then(data => {
  console.log(data);
});

分页UI组件实现

结合DOM操作创建分页控件：

function createPagination(totalPages, currentPage) {
  let paginationHTML = '<div class="pagination">';

  // 上一页按钮
  if (currentPage > 1) {
    paginationHTML += `<button onclick="changePage(${currentPage - 1})">上一页</button>`;
  }

  // 页码按钮
  for (let i = 1; i <= totalPages; i++) {
    paginationHTML += `<button class="${i === currentPage ? 'active' : ''}" onclick="changePage(${i})">${i}</button>`;
  }

  // 下一页按钮
  if (currentPage < totalPages) {
    paginationHTML += `<button onclick="changePage(${currentPage + 1})">下一页</button>`;
  }

  paginationHTML += '</div>';
  document.getElementById('pagination').innerHTML = paginationHTML;
}

function changePage(page) {
  currentPage = page;
  // 重新获取数据或过滤现有数据
  updateDisplay();
}

完整示例（前端分页）

<div id="content"></div>
<div id="pagination"></div>

<script>
  const allData = Array.from({length: 100}, (_, i) => `项目 ${i + 1}`);
  const itemsPerPage = 10;
  let currentPage = 1;

  function displayItems() {
    const startIndex = (currentPage - 1) * itemsPerPage;
    const endIndex = startIndex + itemsPerPage;
    const paginatedItems = allData.slice(startIndex, endIndex);

    document.getElementById('content').innerHTML = 
      paginatedItems.map(item => `<div>${item}</div>`).join('');

    renderPagination();
  }

  function renderPagination() {
    const pageCount = Math.ceil(allData.length / itemsPerPage);
    let paginationHTML = '';

    if (currentPage > 1) {
      paginationHTML += `<button onclick="goToPage(${currentPage - 1})">上一页</button>`;
    }

    for (let i = 1; i <= pageCount; i++) {
      paginationHTML += `<button ${i === currentPage ? 'class="active"' : ''} onclick="goToPage(${i})">${i}</button>`;
    }

    if (currentPage < pageCount) {
      paginationHTML += `<button onclick="goToPage(${currentPage + 1})">下一页</button>`;
    }

    document.getElementById('pagination').innerHTML = paginationHTML;
  }

  function goToPage(page) {
    currentPage = page;
    displayItems();
  }

  // 初始化
  displayItems();
</script>