1、Export2Excel.js 文件内容

/* eslint-disable */
/** 导出Excel需要依赖
* npm install xlsx file-saver -S
* npm install script-loader -S -D 
*/

import { saveAs } from 'file-saver'
// import XLSX from 'xlsx'
import XLSX from 'xlsx-style' //添加斜线这样引入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, fontStyle) {
  var ws = {};
  var range = {
    s: {
      c: 10000000,
      r: 10000000
    },
    e: {
      c: 0,
      r: 0
    }
  };
  let _opts = []
  if (opts) {
    _opts = opts
  }
  console.log('data==', data)
  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]
      };
      //给单个表头添加斜线样式
      if (_opts) {
        if (R == _opts[0] && C == _opts[1]) {
          cell = {
            v: data[R][C],
            s: defaultCellStyle
          }
        }
      }
      //给某一单元格的字体自定义样式
      if (fontStyle) {
        if (R == data.length - 3 && C == 1) {
          cell = {
            v: data[R][C],
            s: fontCellStyle
          }
        }
      }


      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;
}

let fontCellStyle = {
  font: {
    name: '宋体',
    sz: 18,
    color: { rgb: "ff0000" },
    bold: true,
  },
  alignment: {//对齐方式
    horizontal: 'center',//水平居中
    vertical: 'center',//竖直居中
  },
}

let defaultCellStyle = {

  alignment: {
    horizontal: 'center',
    vertical: 'center',
    indent: 0
  },
  border: {
    diagonalDown: true,//斜线方向
    diagonal: {
      color: { rgb: '303133' },
      style: 'thin'
    }//diagonalDown与diagonal必须同时使用
  }
}


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 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")
}

export function export_json_to_excel ({
  multiHeader = [],
  header,
  data,
  filename,
  merges = [],
  maxWidth = '',
  autoWidth = true,
  bookType = 'xlsx',
  diagonal = [],//斜线
  fontStyle = false,
} = {}) {
  /* 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()
  //加样式，如斜线
  if (diagonal) {
    var ws = sheet_from_array_of_arrays(data, diagonal, fontStyle);
  } else {
    var ws = sheet_from_array_of_arrays(data);
  }
  //此处可根据自己习惯做判断应用


  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': maxWidth ? val.toString().length * 2 > maxWidth ? maxWidth : val.toString().length * 2 : val.toString().length * 2
        };
      } else {
        return {
          'wch': maxWidth ? val.toString().length > maxWidth ? maxWidth : val.toString().length : 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;
  }

  if (fontStyle) {

  }


  /* 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}`);
}

处理导出数据js

// 导出数据 转换成Excel表格需要的二维数组
export function formatJson (filterVal, jsonData, fun) {
  return jsonData.map(v =>
    filterVal.map(j => {
      if (fun) {
        return fun(j, v[j])
      } else {
        return v[j]
      }
    })

  )
}

vue页面html使用

import { letterArr } from '@/api'
import { formatJson} from "@/utils/index"
import('@/utils/Export2Excel').then(excel => {
        let tHeader = ['日期', '门票名称'']
        let filterVal = ['createTime', 'ticketName']
        let merges = []
        const merges_arr = [this.A_row_merge, this.B_row_merge]
        // 列合并,this.A_row_merge，this.B_row_merge为需要合并的列，在获取数据列表时做处理，格式为[[1,3],[4,5],[7,9]]
        for (let i = 0; i < merges_arr.length; i++) {
          const row_merge = merges_arr[i];
          for (let j = 0; j < row_merge.length; j++) {
            const element = row_merge[j];
            merges.push(`${letterArr[i]}${element[0] + 2}:${letterArr[i]}${element[1] + 2}`)
          }
        }
        const data = formatJson(filterVal, dataList)
        let filename = `销售汇总`
        excel.export_json_to_excel({
          header: tHeader, //表头 必填
          data, //具体数据 必填
          merges,
          diagonal: [0, 3],//斜线位置（第一行第四列）
          filename: filename, //非必填
        })
      })

样式自定义相关属性中文参考：https://segmentfault.com/a/1190000022772664
相关链接（英文）：
https://www.npmjs.com/package/xlsx-style