vueelementadmin Export2Excel.js导出excel 包含复杂表头和样式修改

安装npm install --save xlsx-style

引入 import XLSX from 'xlsx-style'

引入报错，修改位置\node_modules\xlsx-style\dist\cpexcel.js

找到 var cpt = require(’./cpt’ + ‘able’); 改成 var cpt = cptable;

Export2Excel.js文件代码

/* eslint-disable */
import { saveAs } from 'file-saver'
// import XLSX from 'xlsx'
import XLSX from 'xlsx-style'

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 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 = [],
  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*1.5
        };
      }
    }))
    /*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 dataInfo = wb.Sheets[wb.SheetNames[0]];
  // 设置单元格框线
  const borderAll = {
    top: {
      style: "thin"
    },
    bottom: {
      style: "thin"
    },
    left: {
      style: "thin"
    },
    right: {
      style: "thin"
    }
  };
// 给所有单元格加上边框，内容居中，字体，字号，标题表头特殊格式部分后面替换
  for (var i in dataInfo) {
    if (i == "!ref" || i == "!merges" || i == "!cols" || i == "!rows") { } else {
      dataInfo[i + ""].s = {
        border: borderAll,
        alignment: {
          horizontal: "center",
          vertical: "center"
        },
        font: {
          name: "微软雅黑",
          sz: 10
        }
      };
    }
  }

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

　界面使用：

 <el-button type="primary" icon="el-icon-folder-opened" @click="handleExcel">导出Excel</el-button>

  // 导出excel
    handleExcel() {
      this.downloadLoading = true
      import('@/vendor/Export2Excel').then(excel => {
        const multiHeader = [
          ['序号', '专业', '年级', '班级', '本学期学费类', '', '', '', '', '', '本学期伙食费类', '', '', '', '本学期杂费类', '', '', '', '预交下学期学费'],
          ['', '', '', '', '应缴学费', '已缴学费', '', '减免学费', '待缴学费', '学费退费', '应缴伙食费', '已缴伙食费', '待缴伙食费', '伙食费退费', '应缴杂费', '已缴杂费', '待缴杂费', '杂费退费', '']
        ]

        const header = ['', '', '', '', '', '本学期学费缴费', '已预交本学期学费', '', '', '', '', '', '', '', '', '', '', '', '']
        const filterVal = ['id', 'num', 'money', 'money', 'money', 'money', 'money', 'money', 'money', 'money', 'money', 'money', 'money', 'money', 'money', 'money', 'money', 'money', 'money']
        const data = this.formatJson(filterVal)
        const merges = ['A1:A3', 'B1:B3', 'C1:C3', 'D1:D3', 'E1:J1', 'E2:E3', 'F2:G2', 'H2:H3', 'I2:I3', 'J2:J3', 'K1:N1', 'K2:K3', 'L2:L3', 'M2:M3', 'N2:N3', 'O1:R1', 'O2:O3', 'P2:P3', 'Q2:Q3', 'R2:R3', 'S1:S3'] // 合并单元格的数据
        excel.export_json_to_excel({
          multiHeader,
          header,
          data,
          merges,
          filename: '收退费汇总表'
        })
        this.downloadLoading = false
      })
    },

    formatJson(filterVal) {
      return this.tableData.map(v => filterVal.map(j => {
        return v[j]
      }))
    },

　结果：