vue3 导出Excel

安装包：xlsx      file-saver

src/utils/Export2Excel.js

/* eslint-disable */
import { saveAs } from 'file-saver'
import * as 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;
}

export default {
  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")
  },

  export_json_to_excel({
    multiHeader = [],
    h1,
    h2 = [],
    data,
    filename,
    merges = [],
    autoWidth = true,
    bookType = 'xlsx'
  } = {}) {
    /* original data */
    filename = filename || 'excel-list'
    data = [...data]
    
    data.unshift(h1);
    if(h2.length !== 0) {
      data.unshift(h2);
    }

    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) {
      ws['!merges'] = merges
    } else {
      ws['!merges'] = []
    }
    // if (merges.length > 0) {
    //   if (!ws['!merges']) ws['!merges'] = [];
    //   merges.forEach(item => {
    //     console.log(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}`);
  }
}

src/utils/common.js 

const formatJson = (filterVal, jsonData) => {
            return jsonData.map((v) =>
                filterVal.map((j) => {
                    return v[j];
                })
            )
        }

调用

const exportResponExcel = () => {
            getData('/ContinuousProdution/GetDtResponsibilityInfosByPage', {
                lineCode: prolineCode.value,
                checkTime: dateValue.value,
                banci: banci.value,
                isEdited: true,
                currentPage: 1,
                pageSize: 50000
            }, (response) => {
                let title = ['流水号', '工序段','点停责任类型', '开始时间', '结束时间', '持续时长(s)', '原因类别', '原因详情']
                let filterVal = ['dtSerialNo', 'unitName', 'dtType', 'dtStartTime', 'dtEndTime', 'dtDuration', 'dtReason', 'dtReasonDetail']
                const data = formatJson(filterVal, response.records)
                Export2Excel.export_json_to_excel({
                    h1: title,
                    data,
                    filename: "责任分析"+common.initDatePicker(),
                    merges: [],
                    autoWidth: false,
                    bookType: "xlsx"
                });
            })
        }