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告别后端导出!前端Excel导出终极方案:el-table数据+图片完美融合,点击即下载

  • 2026-04-13 11:14:04
告别后端导出!前端Excel导出终极方案:el-table数据+图片完美融合,点击即下载

一、为什么前端导出Excel这么难?

最近在项目中遇到了一个需求:将el-table中的数据导出为Excel,并且要在表格下方插入图片

💡听起来很简单?实际开发中却遇到了这些问题:

  1. 图片处理难题:前端如何将图片插入到Excel中?

  2. 跨域限制:图片来自CDN,存在跨域问题

  3. 性能瓶颈:当数据量达到5000条时,浏览器直接卡死

  4. 格式混乱:导出的Excel列宽不一致,样式丑陋

传统的解决方案是让后端生成Excel文件,但这样会增加服务器压力,用户体验也不好。难道前端真的不能优雅地解决这个问题吗?

当然可以! 经过一周的探索和实践,我终于找到了一套完美的前端Excel导出方案!

二、方案对比

✨ 在找到最佳方案前,我们先看看常见的几种方案:

方案1:后端生成(传统方案)

// 前端请求后端接口axios.post('/api/export-excel', { data })

优点:功能强大,支持复杂格式缺点:服务器压力大,响应慢,用户体验差

方案2:SheetJS(社区版)

import XLSX from 'xlsx';XLSX.writeFile(workbook, '导出.xlsx');
优点:轻量级,纯数据导出速度快缺点:不支持图片插入,样式控制弱

方案3:xlsx-populate

// 可以操作已有的Excel模板workbook.toFileAsync('输出.xlsx');
优点:支持模板,功能强大缺点:体积较大(1MB+),学习成本高

方案4:exceljs(我们的选择)✅ 

import ExcelJS from 'exceljs';// 功能全面,支持图片、样式、公式等
综合评分:★★★★★推荐理由:功能全面、文档完善、社区活跃、体积适中

三、核心实现:手把手教你实现el-table数据+图片导出

<el-button type="primary" @click="handleExport">导出</el-button>

3.1  安装依赖

# 安装exceljs和文件保存工具npm install exceljs file-saver# 可选:如果处理大量数据,安装lodash提高性能npm install lodash
3.2  两步走,分别导出表格数据和图片
const handleExport async () => {    const tableRef = this.$refs['tableRef'];    // 表头和数据    let tableHeaders = [];    let tableRows = [];    const myChart = this.$refs['lineRef'].$refs['luEchartLine'].myChart;    // 获取图表的 base64 URL    let imgDataURL = myChart.getDataURL({        type'png', // 可以是 'png''jpeg' 等        pixelRatio2, // 图片分辨率比例,默认为1        backgroundColor'#fff' // 背景颜色    });    const workbook new ExcelJS.Workbook();    const worksheet = workbook.addWorksheet('Sheet1');    if(tableRef) {        tableHeaders = tableRef.columns.map(col => col.label);        tableRows = tableRef.data;    } else {        throw new Error('请提供列配置或tableRef');    }    // 添加表头    const headerRow = worksheet.addRow(tableHeaders);    headerRow.font = { bold: true };    // headerRow.fill = {    //  type: 'pattern',    //  pattern: 'solid',    //  fgColor: { argb: '4472C4' }    // };    headerRow.alignment = { horizontal: 'center' };    // 添加数据行    tableRows.forEach(rowData => {        console.log('rowData', rowData);        const rowValue = tableRef.columns.map(col => {            const value = rowData[col.property];            return value;        });        worksheet.addRow(rowValue);    });    // 7. 自动调整列宽    worksheet.columns.forEach((column, index) => {        let maxLength = 0;        column.eachCell({ includeEmptytrue }, cell => {            const cellLength = cell.value ? cell.value.toString().length : 0;            if(cellLength > maxLength) {                maxLength = cellLength;            }        });        column.width = Math.min(Math.max(maxLength, 10), 50);    });    const imageId = workbook.addImage({        buffer: this.base64ToArrayBuffer(imgDataURL),        extension'png',    });    console.log(imageId, 'imageId');    // 指定图片位置(从B2单元格开始)    worksheet.addImage(imageId, {        tl: { col0, row: tableRows.length + 2, offsetX0, offsetY0 },        br: { col16, row: tableRows.length + 16, offsetX0, offsetY0 }    });    // 生成文件    const buffer = await workbook.xlsx.writeBuffer();    // 下载    const blob new Blob([buffer], {        type'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'    });    // FileSaver.saveAs(blob, '导出.xlsx');    const url = URL.createObjectURL(blob);    const = document.createElement('a');    a.href = url;    a.download = '导出.xlsx';    a.click();}
base64ToArrayBuffer(base64Str) {     // 移除数据URI前缀(如果存在)并清理空白字符     base64Str = base64Str.replace(/^data:.+;base64,/'').replace(/\s/g'');     // 补充填充字符     const padding = '='.repeat((4 - base64Str.length % 4) % 4);     const base64 = base64Str + padding;     // 解码并转换     const binaryString = atob(base64);     const bytes = new Uint8Array(binaryString.length);     for (let i = 0; i < binaryString.length; i++) {         bytes[i] = binaryString.charCodeAt(i);     }     return bytes.buffer; },
3.3 核心功能解析
  1. 数据获取
    • 通过this.$refs获取表格组件和图表实例。
    • 图表通过getDataURL()获取base64格式的PNG图片。
    • 表头数据和表格数据通过tableRef.columnstableRef.data获取
  2. Excel生成
    • 使用ExcelJS库创建工作簿(workbook)和工作表(worksheet)
    • 自动根据内容长度调整列宽(10-50字符限制)
    • 表格数据按行插入,表头加粗居中
  3. 图表插入
    • 将base64图片转为ArrayBuffer后插入
    • 图片位置通过tl(左上角)和br(右下角)坐标控制
    • 图片放置在表格数据下方(行号=数据行数+2)
  4.图表插入
    • Blob生成Excel文件并创建a标签下载
    • 通过FileSaver.saveAs()下载

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  1. CONNECT:[ UseTime:0.035181s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000947s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.069120s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.163026s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.003488s ]
  6. SELECT * FROM `set` [ RunTime:0.082132s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001061s ]
  8. SELECT * FROM `article` WHERE `id` = 459853 LIMIT 1 [ RunTime:0.086227s ]
  9. UPDATE `article` SET `lasttime` = 1776864712 WHERE `id` = 459853 [ RunTime:0.144535s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.111633s ]
  11. SELECT * FROM `article` WHERE `id` < 459853 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.159242s ]
  12. SELECT * FROM `article` WHERE `id` > 459853 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.033133s ]
  13. SELECT * FROM `article` WHERE `id` < 459853 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010098s ]
  14. SELECT * FROM `article` WHERE `id` < 459853 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.048162s ]
  15. SELECT * FROM `article` WHERE `id` < 459853 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.205660s ]
1.292634s