Vue2实现导出Excel文件，并设置行高，宽度，合并单元格等。

//一、安装xlsx和xlsx-style-fixedver
npm install xlsx
npm install xlsx-style-fixedver

注意：如安装过程发生如下报错，请更换为官方源

npm config set registry https://registry.npmjs.org/

二、使用实例：

//封装
/* eslint-disable */
import { saveAs } from 'file-saver'
import XLSX from 'xlsx'
import XLSXStyle from 'xlsx-style-fixedver'
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){
        cell.v = ''
      };
      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 numberToExcelColumn(number) {
    const array = [];
    let numToString = function(nnum) {
      let num = nnum - 1;
      let a = parseInt(num / 26);
      let b = num % 26;
      array.unshift(b + 'A'.charCodeAt()); // A charCode 65
      if (a > 0) {
        numToString(a);
      }
    }
    numToString(number);
    // 转为字符串
    let char = '';
    for (let i = 0; i < array.length; i++) {
      char += String.fromCharCode(parseInt(array[i]));
    }
    return char;
}
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 = [],
  sums=[],
  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, { origin: 'A2' });
  ws = XLSX.utils.json_to_sheet(data, { origin: 'A1' })
  //根据表头列数合并第一行
  var merges = [
      'A1:'+numberToExcelColumn(header.length)+'1'
  ]
  if (merges.length > 0) {
    if (!ws['!merges']) ws['!merges'] = [];
    merges.forEach(item => {
      ws['!merges'].push(XLSX.utils.decode_range(item))
    })
  }
  let borderAll = { // 单元格外侧框线
    top: {
      style: 'thin',
      color: { rgb: '000000' }
    },
    bottom: {
      style: 'thin',
      color: { rgb: '000000' }
    },
    left: {
      style: 'thin',
      color: { rgb: '000000' }
    },
    right: {
      style: 'thin',
      color: { rgb: '000000' }
    }
  }
  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;
  }
    const itemHeight = []
  for (const key in ws) {
    itemHeight.push({ hch: 20 })
    // 设置公共样式
    if (ws[key] instanceof Object) {
      if(key == 'A1'){
        ws[key].v = filename
        ws[key].s = {
          border: borderAll, // 边框样式设置
          alignment: { // 文字样式设置
            horizontal: 'center', // 字体水平居中
            vertical: 'center', // 垂直居中
            wrapText: 1 // 自动换行
          },
          // fill: { //背景色
          //   fgColor: { rgb: '000000' }
          // },
          font: { // 单元格中字体的样式与颜色设置
            sz: 16,
            color: {
              rgb: '000000'
            },
            bold: true
          },
          bold: true,
          numFmt: 0
        }
      }else{
        ws[key].s = {
          border: borderAll, // 边框样式设置
          alignment: { // 文字样式设置
            horizontal: 'center', // 字体水平居中
            vertical: 'center', // 垂直居中
            wrapText: 1 // 自动换行
          },
          // fill: { //背景色
          //   fgColor: { rgb: '000000' }
          // },
          font: { // 单元格中字体的样式与颜色设置
            sz: 10,
            color: {
              rgb: '000000'
            },
            bold: false
          },
          bold: true,
          numFmt: 0
        }
      }
    }
  }
  ws['!rows'] = itemHeight
  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;

var wbout = XLSXStyle.write(wb, {
bookType: bookType,
bookSST: false,
type: 'binary'
});
try {
wbout.then(res => {
const wbBlob = new Blob([s2ab(res)], {
type: 'application/octet-stream'
})
saveAs(wbBlob, ${filename}.${bookType})
})
} catch (error) {
const wbBlob = new Blob([s2ab(wbout)], {
type: 'application/octet-stream'
})
saveAs(wbBlob,${filename}.${bookType})
}
}


//组件调用
     handleDown() {
        if(this.newList.length <= 0){
          this.$message.error('当前没有数据可导出')
          return
        }
        this.downloadLoading = true
        import('@/vendor/Export2Excel').then(excel => {
          let tHeader = []
          let filterVal = []
          let fileName = this.listQuery.between[0]+' 到 '+this.listQuery.between[1]+'应收应付时间段数据'
          let tableColumn = this.$refs.newList.getTableColumn()
          if(tableColumn){
            tableColumn.fullColumn.forEach((item) => {
              if (item.title != undefined && item.property != undefined) {
                filterVal.push(item.property)
                tHeader.push(item.title)
              }
            });
            const data = this.formatJson(filterVal)
            excel.export_json_to_excel({
              header: tHeader,
              data,
              filename: fileName
            })
          }
          this.downloadLoading = false
        })
      },
      formatJson(filterVal) {
        let {fullData, visibleData, tableData, footerData} = this.$refs.newList.getTableData()
        return visibleData.map(v => filterVal.map(j => {
          if (j === 'timestamp') {
            return parseTime(v[j])
          } else {
            if(j==='sykpje'){
              return this.calculateFloat(v['je']-v['KPJE'])
            }
            return v[j]
          }
        }))
      }