需求是这样的：
东西太多了，合并单元格，行高，列宽，边框样式，字体样式，合计啥的，直接上代码吧

export function exportExce({
  header,		//子表数据头信息
  data,			//子表数据
  masterTable,	//主表数据
  foot,			//页脚
  filename,		//文件名
  autoWidth = true,
  bookType = 'xlsx'
} = {}) {
  filename = filename || 'excel'
  data = [...data]			
  data.unshift(header);		//子表添加头信息
  data.push(foot)			//添加页脚（不一定非要在这填，可以后边追加）
  data.push([""])			//加一行空，不知为啥最后一行老是不展示，出此下策，如果没这个问题的话可以去掉
  let ws_name = "SheetJS";
  //处理主表内容
  let keyList = Object.keys(masterTable)
  let valueList = Object.values(masterTable)
  let mastertableList = []
  for (let i = 0; i < keyList.length; i += 2) {
    mastertableList.push([keyList[i], valueList[i] ? valueList[i] : '', '', '', keyList[i + 1] ? keyList[i + 1] : '', valueList[i + 1] ? valueList[i + 1] : ''])
  }
  let newTableData = [...mastertableList, [], ...data]//这个新数组是主表+字表
  let wb = new Workbook(),
    ws = sheet_from_array_of_arrays2(newTableData, 1);//得到单元格对象
  if (autoWidth) {									  //设置所有格属性
    /*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;
  }
  ws["A1"] = { t: "s", v: filename };				//添加表格头信息
  ws["A1"].s = {									//为某个单元格设置单独样式
    font: {
      name: '宋体',
      sz: 24,
      bold: true,
      color: { rgb: "FFFFAA00" }
    },
    alignment: { horizontal: "center", vertical: "center", wrap_text: true },
    fill: { bgcolor: { rgb: 'ffff00' } }
  }
  //需要合并单元格的数组处理
  let mergeclumns = []
  mastertableList.forEach((element, index) => {
    mergeclumns.push({
      s: {//s为开始
        c: 1,//开始列
        r: index + 1//开始取值范围
      },
      e: {//e结束
        c: 3,//结束列 
        r: index + 1//结束范围
      }
    })
    mergeclumns.push({
      s: {
        c: 5,
        r: index + 1
      },
      e: {
        c: 7,
        r: index + 1
      }
    })
  });
  ws["!merges"] = [{
    s: {
      c: 0,
      r: 0
    },
    e: {
      c: ws['!cols'].length - 1,
      r: 0
    }
  }, ...mergeclumns,
  {
    s: {
      c: 0,
      r: mastertableList.length + 1
    },
    e: {
      c: ws['!cols'].length - 1, 
      r: mastertableList.length + 1
    }
  },
  {
    s: {
      c: 0,
      r: newTableData.length-1
    },
    e: {
      c: ws['!cols'].length - 1,
      r: newTableData.length-1
    }
  }];
  ws['!cols'] = [{wch: 10}]				//还是自定义样式：第一列列宽
  ws['!rows'] = [{hpx: 25}]				//还是自定义样式：第一行行高
  wb.SheetNames.push(ws_name);			//文件名
  wb.Sheets[ws_name] = ws;				//单元格内容

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

处理表格数据函数：

/** 
* 参数：		 data：需要转换的参数
* 		topLength：距离顶部的单元
*/
function sheet_from_array_of_arrays2(data, topLength, opts) {
  let ws = {};
  let range = {
    s: {
      c: 10000000,
      r: 10000000
    },
    e: {
      c: 0,
      r: 0
    }
  };
  for (let R = 0; R !== data.length; ++R) {
    for (let 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;
      let cell = {
        v: data[R][C]
      };
      if (cell.v === null) continue;
      let cell_ref = XLSX.utils.encode_cell({
        c: C,
        r: R + topLength
      });
      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;
}

大概就这些。。。希望对你有帮助。。。嗯