原生js用Export2Excel导出excel单级表头和多级表头数据方式实现

原生js用Export2Excel导出excel单级表头和多级表头数据方式实现

因为项目框架的原因，不是使用纯vue开发的，所以用不了import的方式导入 file-saver 和 xlsx 的三方插件包去实现，索性我就把这两个文件下载本地，然后在HTML使用 script 标签的方式来实现。下面是具体实现方式：

HTML文件导入需要的文件

1、新建文件夹 命名为js，把对应的js文件放到里面，在js文件同级新建个表格导出.html 文件；
2、这里我用到了三个文件：FileSaver.min.js、xlsx.full.min.js、Export2Excel.js
3、注意其中的Export2Excel.js 是需要自己写的，其他两个文件去对应的GitHub地址下载即可，如果找不到可以评论区聊我，我看到可以私发你，这个Export2Excel.js 文件代码我粘贴在文章里面，直接复制使用，如下：

/* eslint-disable */
// 注意html中script js不能直接使用import方式导入文件， 需要把这两个js文件下载后，通过script方式加载进去
// import { saveAs } from 'file-saver'
// import XLSX from 'xlsx'

function generateArray(table) {
  var out = []
  var rows = table.querySelectorAll('tr')
  var ranges = []
  for (var R = 0; R < rows.length; ++R) {
    var outRow = []
    var row = rows[R]
    var columns = row.querySelectorAll('td')
    for (var C = 0; C < columns.length; ++C) {
      var cell = columns[C]
      var colspan = cell.getAttribute('colspan')
      var rowspan = cell.getAttribute('rowspan')
      var cellValue = cell.innerText
      if (cellValue !== "" && cellValue == +cellValue) cellValue = +cellValue

      //Skip ranges
      ranges.forEach(function (range) {
        if (R >= range.s.r && R <= range.e.r && outRow.length >= range.s.c && outRow.length <= range.e.c) {
          for (var i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null)
        }
      })

      //Handle Row Span
      if (rowspan || colspan) {
        rowspan = rowspan || 1
        colspan = colspan || 1
        ranges.push({
          s: {
            r: R,
            c: outRow.length
          },
          e: {
            r: R + rowspan - 1,
            c: outRow.length + colspan - 1
          }
        })
      };

      //Handle Value
      outRow.push(cellValue !== "" ? cellValue : null)

      //Handle Colspan
      if (colspan)
        for (var k = 0; k < colspan - 1; ++k) outRow.push(null)
    }
    out.push(outRow)
  }
  return [out, ranges]
};

function datenum(v, date1904) {
  if (date1904) v += 1462
  var epoch = Date.parse(v)
  return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000)
}

function sheet_from_array_of_arrays(data, opts) {
  var ws = {}
  var range = {
    s: {
      c: 10000000,
      r: 10000000
    },
    e: {
      c: 0,
      r: 0
    }
  }
  for (var R = 0; R != data.length; ++R) {
    for (var C = 0; C != data[R].length; ++C) {
      if (range.s.r > R) range.s.r = R
      if (range.s.c > C) range.s.c = C
      if (range.e.r < R) range.e.r = R
      if (range.e.c < C) range.e.c = C
      var cell = {
        v: data[R][C]
      }
      if (cell.v == null) continue
      var cell_ref = XLSX.utils.encode_cell({
        c: C,
        r: R
      })

      if (typeof cell.v === 'number') cell.t = 'n'
      else if (typeof cell.v === 'boolean') cell.t = 'b'
      else if (cell.v instanceof Date) {
        cell.t = 'n'
        cell.z = XLSX.SSF._table[14]
        cell.v = datenum(cell.v)
      } else cell.t = 's'

      ws[cell_ref] = cell
    }
  }
  if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range)
  return ws
}

function Workbook() {
  if (!(this instanceof Workbook)) return new Workbook()
  this.SheetNames = []
  this.Sheets = {}
}

function s2ab(s) {
  var buf = new ArrayBuffer(s.length)
  var view = new Uint8Array(buf)
  for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF
  return buf
}

function export_table_to_excel(id) {
  var theTable = document.getElementById(id)
  var oo = generateArray(theTable)
  var ranges = oo[1]

  /* original data */
  var data = oo[0]
  var ws_name = "SheetJS"

  var wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data)

  /* add ranges to worksheet */
  // ws['!cols'] = ['apple', 'banan'];
  ws['!merges'] = ranges

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name)
  wb.Sheets[ws_name] = ws

  var wbout = XLSX.write(wb, {
    bookType: 'xlsx',
    bookSST: false,
    type: 'binary'
  })

  saveAs(new Blob([s2ab(wbout)], {
    type: "application/octet-stream"
  }), "test.xlsx")
}


function export_json_to_excel({
  multiHeader = [],
  header,
  data,
  filename,
  merges = [],
  autoWidth = true,
  bookType = 'xlsx'
} = {}) {
  /* original data */
  filename = filename || 'excel-list'
  data = [...data]
  data.unshift(header)

  for (let i = multiHeader.length - 1; i > -1; i--) {
    data.unshift(multiHeader[i])
  }

  var ws_name = "SheetJS"
  var wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data)

  if (merges.length > 0) {
    if (!ws['!merges']) ws['!merges'] = []
    merges.forEach(item => {
      ws['!merges'].push(XLSX.utils.decode_range(item))
    })
  }

  if (autoWidth) {
    /*设置worksheet每列的最大宽度*/
    const colWidth = data.map(row => row.map(val => {
      /*先判断是否为null/undefined*/
      if (val == null) {
        return {
          'wch': 10
        }
      }
      /*再判断是否为中文*/
      else if (val.toString().charCodeAt(0) > 255) {
        return {
          'wch': val.toString().length * 2
        }
      } else {
        return {
          'wch': val.toString().length
        }
      }
    }))
    /*以第一行为初始值*/
    let result = colWidth[0]
    for (let i = 1; i < colWidth.length; i++) {
      for (let j = 0; j < colWidth[i].length; j++) {
        if (result[j]['wch'] < colWidth[i][j]['wch']) {
          result[j]['wch'] = colWidth[i][j]['wch']
        }
      }
    }
    ws['!cols'] = result
  }

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name)
  wb.Sheets[ws_name] = ws

  var wbout = XLSX.write(wb, {
    bookType: bookType,
    bookSST: false,
    type: 'binary'
  })
  saveAs(new Blob([s2ab(wbout)], {
    type: "application/octet-stream"
  }), `${filename}.${bookType}`)
}

HTML文件中实现导出函数

  <script>
    console.log(XLSX)  // 打印看看  XLSX
    console.log(FileSaver)  // 打印看看  FileSaver
    console.log(export_json_to_excel)  // 打印看看export_json_to_excel 方法
    
    function downLoad() {
      let arr = [{
        sno: 1000,
        username: "fqniu",
        gender: "男",
        age: 27,
        card: "4****************7"
      }, {
        sno: 1001,
        username: "fqniu1",
        gender: "男",
        age: 27,
        card: "4****************8"
      },
      {
        sno: 1002,
        username: "fqniu2",
        gender: "男",
        age: 27,
        card: "4****************9"
      }]
      // 单级表格
      const tHeader = ["编号", "姓名", "性别", "年龄", "身份证号"]
      const filterVal = ["sno", "username", "gender", "age", "card"]
      const list = arr
      const data = formatJson(filterVal, list)
      export_json_to_excel({
        header: tHeader,
        data,
        filename: "单级表格",
        autoWidth: true,
        bookType: "xlsx",
      })
    }

    // 多级表头
    function downLoad1() {

      let arr1 = [
        {
          date: '2024-08-17',
          num1: '1',
          count1: '10',
          num2: '11',
          count2: '100',
          num3: '111',
          count3: '1000',
          total: '1110',
        },
        {
          date: '2024-08-18',
          num1: '2',
          count1: '20',
          num2: '22',
          count2: '200',
          num3: '222',
          count3: '2000',
          total: '2220',
        },
        {
          date: '2024-08-19',
          num1: '3',
          count1: '30',
          num2: '33',
          count2: '300',
          num3: '333',
          count3: '3000',
          total: '3330',
        }
      ]
      let filterVal1 = ['date', 'num1', 'count1', 'num2', 'count2', 'num3', 'count3', 'total'
      ]
      const data1 = formatJson(filterVal1, arr1)
      export_json_to_excel({
        multiHeader: [
          ['日期', '上期结存', '', '本期结存', '', '下期结存', '', '总数']
        ],
        header: ['', '数量', '金额', '数量', '金额', '数量', '金额', ''
        ], //表头 必填
        data: data1, //具体数据 必填
        filename: '多级表头的表格',
        // 要合并的单元格
        merges: ['A1:A2', 'B1:C1', 'D1:E1', 'F1:G1', 'H1:H2'],
        autoWidth: true,
        bookType: 'xlsx',
      })
    }

    function formatJson(filterVal, jsonData) {
      return jsonData.map((v) =>
        filterVal.map((j) => {
          if (j === "timestamp") {
            return parseTime(v[j])
          } else {
            return v[j]
          }
        })
      )
    }
  </script>

导出的Excel文件内容截图如下：

单级表头效果

多级级表头效果

注意点：

导出多级表头首先要理解，单元格合并规则：

日期 所占单元格为 A1:A3
配送信息 所占单元格为 B1:F1
姓名 所占单元格为 B2:B3

然后依次类推即可

注：图片引用网络，仅用于学习分享

HTML总代码实现汇总（直接复制代码，注意js引入路径）

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script src="./js/FileSaver.min.js"></script>
  <script src="./js/xlsx.full.min.js"></script>
  <script src="./js/Export2Excel.js"></script>
  <script>
    console.log(XLSX)
    console.log(FileSaver)
    console.log(export_json_to_excel)
    function downLoad() {
      let arr = [{
        sno: 1000,
        username: "fqniu",
        gender: "男",
        age: 27,
        card: "4****************7"
      }, {
        sno: 1001,
        username: "fqniu1",
        gender: "男",
        age: 27,
        card: "4****************8"
      },
      {
        sno: 1002,
        username: "fqniu2",
        gender: "男",
        age: 27,
        card: "4****************9"
      }]
      // 单级表格
      const tHeader = ["编号", "姓名", "性别", "年龄", "身份证号"]
      const filterVal = ["sno", "username", "gender", "age", "card"]
      const list = arr
      const data = formatJson(filterVal, list)
      export_json_to_excel({
        header: tHeader,
        data,
        filename: "单级表格",
        autoWidth: true,
        bookType: "xlsx",
      })
    }

    // 多级表头
    function downLoad1() {
      let arr1 = [
        {
          date: '2024-08-17',
          num1: '1',
          count1: '10',
          num2: '11',
          count2: '100',
          num3: '111',
          count3: '1000',
          total: '1110',
        },
        {
          date: '2024-08-18',
          num1: '2',
          count1: '20',
          num2: '22',
          count2: '200',
          num3: '222',
          count3: '2000',
          total: '2220',
        },
        {
          date: '2024-08-19',
          num1: '3',
          count1: '30',
          num2: '33',
          count2: '300',
          num3: '333',
          count3: '3000',
          total: '3330',
        }
      ]
      let filterVal1 = ['date', 'num1', 'count1', 'num2', 'count2', 'num3', 'count3', 'total'
      ]
      const data1 = formatJson(filterVal1, arr1)
      export_json_to_excel({
        multiHeader: [
          ['日期', '上期结存', '', '本期结存', '', '下期结存', '', '总数']
        ],
        header: ['', '数量', '金额', '数量', '金额', '数量', '金额', ''
        ], //表头 必填
        data: data1, //具体数据 必填
        filename: '多级表头的表格',
        // 要合并的单元格
        merges: ['A1:A2', 'B1:C1', 'D1:E1', 'F1:G1', 'H1:H2'],
        autoWidth: true,
        bookType: 'xlsx',
      })
    }

    function formatJson(filterVal, jsonData) {
      return jsonData.map((v) =>
        filterVal.map((j) => {
          if (j === "timestamp") {
            return parseTime(v[j])
          } else {
            return v[j]
          }
        })
      )
    }
  </script>

  <div id="box">点击下载单级表格</div>
  <div id="box1">点击下载多级表格</div>

  <script>
    let box = document.getElementById('box')
    box.onclick = () => {
      downLoad()
    }
    let box1 = document.getElementById('box1')
    box1.onclick = () => {
      downLoad1()
    }
  </script>

</body>
</html>

以上就是我使用原生js用Export2Excel导出excel单级表头和多级表头数据方式实现的方式，内容比较简单，代码功能单一，仅限于导出个Excel内容文件，如果复杂功能，可能需要进一步研究，谢谢！