Node.js服务使用exceljs生成excel，实现导出

最近在使用node.js + exceljs做导出功能, 总结一下其基本使用方法：

依赖库引入

const fs = require('fs')
const Excel = require('exceljs')

初始化Excel

const workbook = new Excel.Workbook()
workbook.creator = 'test'
workbook.lastModifiedBy = 'test'
workbook.created = new Date()
workbook.modified = new Date()

生成一个工作表

let sheet = workbook.addWorksheet('2018-10报表')

# Add column headers and define column keys and widths
sheet.columns = [
  {header: '创建日期', key: 'create_time', width: 15},
  {header: '单号', key: 'id', width: 15},
  {header: '电话号码', key: 'phone', width: 15},
  {header: '地址', key: 'address', width: 15}
]
const data = [{
  create_time: '2018-10-01',
  id: '787818992109210',
  phone: '11111111111',
  address: '深圳市'
}]
# Add an array of rows
sheet.addRows(data)

生成excel文件

const filePath = `server/attachement/用户报表.xlsx`
return await workbook.xlsx.writeFile(filePath).then( async () => {
  this.ctx.attachment(`用户报表.xlsx`)
  this.ctx.type = '.xlsx'
  this.ctx.body = fs.readFileSync(filePath)
}, function (err: any) {
  console.log(err)
})

在一些复杂的情况下，我们可能需要生成多级表头，如下图：

屏幕快照 2018-11-29 上午11.37.08.png

// 添加表头
sheet.getRow(1).values = ['种类', '销量',,,, '店铺']
sheet.getRow(2).values = ['种类', '2018-05', '2018-06', '2018-07', '2018-08', '店铺']

// 添加数据项定义，与之前不同的是，此时去除header字段
sheet.columns = [
  {key: 'category', width: 30},
  {key: '2018-05', width: 30},
  {key: '2018-06', width: 30},
  {key: '2018-07', width: 30},
  {key: '2018-08', width: 30},
  {key: 'store', width: 30},
]
  const data = [{
  category: '衣服',
  '2018-05': 300,
  '2018-06': 230,
  '2018-07': 730,
  '2018-08': 630,
  'store': '王小二旗舰店'
}, {
  category: '零食',
  '2018-05': 672,
  '2018-06': 826,
  '2018-07': 302,
  '2018-08': 389,
  'store': '吃吃货'
}]
  sheet.addRows(data)

// 合并单元格
  sheet.mergeCells(`B1:E1`)
  sheet.mergeCells('A1:A2')
  sheet.mergeCells('F1:F2')

// 设置每一列样式
  const row = sheet.getRow(1)
  row.eachCell((cell, rowNumber) => {
    sheet.getColumn(rowNumber).alignment = {vertical: 'middle', horizontal: 'center'}
    sheet.getColumn(rowNumber).font = {size: 14, family: 2}
  })