将 Element UI 表格元素导出为 Excel 文件(处理了多级表头和固定列导出的问题）

import { saveAs } from 'file-saver'
import XLSX from 'xlsx'
/*** 将 Element UI 表格元素导出为 Excel 文件* @param {HTMLElement} el - 要导出的 Element UI 表格的 DOM 元素* @param {string} filename - 导出的 Excel 文件的文件名（不包含扩展名）*/
export function exportElementTable(el, filename) {// 深拷贝表格元素避免污染原始DOMconst clonedEl = el.cloneNode(true)// 移除fixed列容器（避免重复内容）const fixedElements = clonedEl.querySelectorAll('.el-table__fixed, .el-table__fixed-right, .el-table__fixed-left')if (fixedElements && fixedElements.length > 0) {for (let i = 0; i < fixedElements.length; i++) {const fixedEl = fixedElements[i]if (fixedEl.parentNode) {fixedEl.parentNode.removeChild(fixedEl)}}}// 获取原始表头和表体的核心table元素const headerTable = clonedEl.querySelector('.el-table__header-wrapper table')const bodyTable = clonedEl.querySelector('.el-table__body-wrapper table')// 创建新表格容器（保留原始table的class和样式）const mergedTable = document.createElement('table')if (headerTable && headerTable.className) {mergedTable.setAttribute('class', headerTable.className)}// 复制表头结构（关键：保留多级表头的tr层级）if (headerTable) {const thead = document.createElement('thead')const headerRows = headerTable.getElementsByTagName('tr')if (headerRows && headerRows.length > 0) {for (let i = 0; i < headerRows.length; i++) {const tr = headerRows[i]thead.appendChild(tr.cloneNode(true))}}mergedTable.appendChild(thead)}// 复制表体结构（保留数据行）if (bodyTable) {const tbody = document.createElement('tbody')const bodyRows = bodyTable.getElementsByTagName('tr')if (bodyRows && bodyRows.length > 0) {for (let i = 0; i < bodyRows.length; i++) {const tr = bodyRows[i]tbody.appendChild(tr.cloneNode(true))}}mergedTable.appendChild(tbody)}// 关键修复：重新计算并保留合并单元格属性const allCells = mergedTable.getElementsByTagName('th')const dataCells = mergedTable.getElementsByTagName('td')const combinedCells = [].concat(Array.from(allCells), Array.from(dataCells))for (let i = 0; i < combinedCells.length; i++) {const cell = combinedCells[i]if (cell) {const rowSpan = cell.getAttribute('data-rowspan') || 1const colSpan = cell.getAttribute('data-colspan') || 1if (rowSpan > 1) {cell.setAttribute('rowspan', rowSpan)}if (colSpan > 1) {cell.setAttribute('colspan', colSpan)}}}// 转换配置（关键：启用display模式保留表格结构）const workbook = XLSX.utils.table_to_book(mergedTable, {raw: true,display: true, // 启用display模式，正确解析合并单元格和层级cellDates: true, // 保留日期格式（可选）})// 生成并保存文件const wbout = XLSX.write(workbook, {bookType: 'xlsx',bookSST: true,type: 'array',})saveAs(new Blob([wbout], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' }),`${filename}.xlsx`)
}