实现功能：分标题行导出数据过多，一个sheet表里表格条数有限制，需要分sheet显示。

步骤1:安装插件包

npm install exceljs

npm install xlsx

步骤2：引用包

    import XLSX from 'xlsx';
    import ExcelJS from 'exceljs';

步骤3：举例按关键代码说明

//通用方法
async xlsxExport(titles,columns,data,pageSize){let workbook = new ExcelJS.Workbook();				let pageNo = Math.ceil(data.length*1.0/pageSize);for(var p=0;p<pageNo;p++){//创建Sheet表const worksheet = workbook.addWorksheet('Sheet'+(p+1));				  for(let t=1;t<=titles.length;t++){ //判断单元格是否已合并if(!worksheet.getRow(t).getCell(1).isMerged){worksheet.mergeCells( t, 0 ,t, columns.length );}//合并单元格填充值worksheet.getRow(t).getCell(1).value=titles[t-1];//单元格增加样式if(t==1){worksheet.getRow(t).getCell(1).alignment = { vertical: 'middle', horizontal: 'center' };worksheet.getRow(t).getCell(1).font = { bold: true, size: 16 };}else{				worksheet.getRow(t).getCell(1).alignment = {vertical: 'middle', horizontal: 'left' };}}//填充标题列worksheet.addRow(columns);let pdata = [];//组织当前sheet的数据结构data.forEach(item=>{if(item[0]>=p*pageSize && item[0]<=(p+1)*pageSize){pdata.push(item);}});worksheet.addRows(pdata);}//所有sheet填充完，写入xlsx文件并下载const buffer = await workbook.xlsx.writeBuffer();const blob = new Blob([buffer], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' });// 创建下载链接const url = URL.createObjectURL(blob);const link = document.createElement('a');link.href = url;link.download = titles[0]+".xlsx";document.body.appendChild(link);link.click();document.body.removeChild(link);URL.revokeObjectURL(url);						}

步骤4：举例应用

let str2 = `ROWS,A,B,C`;
let titles=["excel导出实例",`当前日期：${this.currTime}];
let columns=["序号","A对应的列标题","B对应的列标题","C对应的列标题"];
let data =[{[对应str2的值]},{[对应str2的值]}];//对应数据值
let pageSize = 1000;//对应sheet表显示条数
await this.xlsxExport(titles,columns,data,pageSize);