vue2导出excel，合并单元格的表格

1.先引入一个js文件，作为主要导出函数

/* eslint-disable */
import fileSaver from 'file-saver'
// import Blob from '@/vendor/Blob'
import xlsxDist from 'script-loader!xlsx/dist/xlsx.core.min'
require('script-loader!file-saver');
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);
  // console.log('a')
  var oo = generateArray(theTable);
  var ranges = oo[1];

  /* original data */
  var data = oo[0];
  var ws_name = "SheetJS";
  // console.log(data);

  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")
}

// function formatJson(jsonData) {
//   console.log(jsonData)
// }

// export function export_json_to_excel({
//   multiHeader2 = [],	// 第一行表头
//   multiHeader = [], // 第二行表头
//   header,	// 第三行表头
//   data,
//   filename, //文件名
//   merges = [], // 合并
//   autoWidth = true,
//   bookType = 'xlsx'
// } = {}) {
//   /* original data */
//   filename = filename || '列表';
//   data = [...data]
//   data.unshift(header);

//   for (let i = multiHeader2.length - 1; i > -1; i--) {
//     data.unshift(multiHeader2[i])
//   }

//   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
//         };
//       }
//     }))
//     /*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}`);
// }

export function export_json_to_excel({
  title,
  multiHeader = [],
  header,
  data,
  filename,
  merges = [],
  autoWidth = true,
  bookType = 'xlsx',
  myRowFont = '1',
  multiHeader1,
  multiHeader2,
} = {}) {
  /* original data */
  filename = filename || 'excel-list'
  data = [...data]
   data.unshift(header);
   data.unshift(multiHeader2);
  data.unshift(multiHeader1);
  data.unshift(title);
  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>30?30:val.toString().length*2
              };
          } else {
              return {
                  'wch': val.toString().length>50?50: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['!rows'] = [{hpx: 120}]  // 设置表格第一行高度为120
  }

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;
  var dataInfo = wb.Sheets[wb.SheetNames[0]];

  const borderAll = {  //单元格外侧框线
      top: {
          style: 'thin'
      },
      bottom: {
          style: 'thin'
      },
      left: {
          style: 'thin'
      },
      right: {
          style: 'thin'
      }
  };
  //给所以单元格加上边框
  for (var i in dataInfo) {
    if (i == '!ref' || i == '!merges' || i == '!cols' || i == 'A1') {

    } else {
      dataInfo[i + ''].s = {
        border: borderAll
      }
    }
  }
  // 去掉标题边框
  let arr = ["A1", "B1", "C1", "D1", "E1", "F1", "G1","H1","I1","J1","K1","L1"];
  arr.some(v => {
    // console.log(v)
    let a = merges[0].split(':')
    // console.log(a)
    if (v == a[1]) {
        // console.log(dataInfo[v])
        dataInfo[v].s = {}
        return true;
    } else {
        // console.log(dataInfo[v])
        dataInfo[v]
        dataInfo[v].s = {
        }
    }
  })

  //设置某单元格的样式
  dataInfo["A1"].s = {
    font: {
      // name: '宋体',    // 字体
      sz: 20, // 字体大小
      color: { rgb: "000000" },   // 字体颜色
      // color: { rgb: "00A06E" },   // 字体颜色
      bold: true, // 粗体
      italic: false,  // 斜体
      underline: false    // 下划线
    },
    alignment: {
      horizontal: "center",  // 水平垂直
      vertical: "center",
      wrapText:1  // 自动换行，换行字符："\r\n"
    },
    fill: {
      // fgColor: { rgb: "008000" },
      fgColor: { rgb: "DEDEE0" },
    },
  };
  //给结尾加上样式
console.log(2222222222222222222222222,data.length);
  dataInfo[`A${data.length}`].s = {
    alignment: {
      vertical: "center",
      wrapText:1  // 自动换行，换行字符："\r\n"
    },
  };

  // 这是表头行的样式
  var tableTitleFont = {
      font: {
        name: '宋体',
        sz: 18,
        color: { rgb: "000000" },
        bold: true,
        italic: false,
        underline: false
      },
      border: borderAll,
      alignment: {
        horizontal: "center",
        vertical: "center"
      },
      fill: {
        fgColor: { rgb: "DEDEE0" }  //表头的背景颜色
      },
  };

  for (var b in dataInfo) {
    // console.log(b)

    // console.log(myRowFont)
    // console.log(b.indexOf(myRowFont))


    // if (b.indexOf(myRowFont) > -1) {
    //   if(dataInfo[b].v){
    //     dataInfo[b].s = tableTitleFont
    //   }
    // }
  }

  // console.log(merges);
  // console.log(dataInfo);

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

2. 在vue中定义导出函数

 exportExcelSmt() {
      const exportList = [];
      //处理数据为一维数组
      require.ensure([], () => {
        const {
          export_json_to_excel
        } = require("../../vendor/inspectionFormExcel");
        const tHeader = [];//导出列表内容字段名称 例如：['姓名','性别']

        const title = [];//导出表头可合并 例如：['信息表','']
        const multiHeader1 = [];//第一行内容，可自行调整 例如：['姓名','name']
        const multiHeader2 = [];//第二行内容

        const filterVal = [];//导出列表字段 例如：['name','sex']
        var list = exportList;
        //合并相同单元格函数
        function findConsistentProductSNRanges(inputArray) {
          let result = [];
          let startIdx = 0;

          for (let i = 1; i <= inputArray.length; i++) {
            if (
              i === inputArray.length ||
              inputArray[i].ItemCode !== inputArray[startIdx].ItemCode
            ) {
              let range = `A${startIdx + 4}:A${i + 3}`;
              let SNrange = `B${startIdx + 4}:B${i + 3}`;
              let Userrange = `C${startIdx + 4}:C${i + 3}`;
              let Timerange = `D${startIdx + 4}:D${i + 3}`;
              result.push(range);
              result.push(SNrange);
              result.push(Userrange);
              result.push(Timerange);
              if (i < inputArray.length) {
                startIdx = i;
              }
            }
          }
          return result;
        }
        const hebingList = findConsistentProductSNRanges(list);
        const merges = ["A1:L1", "A3:F3", "G3:L3", ...hebingList]; //合并单元格
        const data = this.formatJson(filterVal, list);
        export_json_to_excel({
          title: title,
          header: tHeader,
          data,
          merges,
          filename: this.getNowTime(),
          autoWidth: true,
          bookType: "xlsx",
          multiHeader1: multiHeader1,
          multiHeader2: multiHeader2
        });
      });
    }

3.其余函数?

formatJson(filterVal, jsonData) {
      return jsonData.map(v => filterVal.map(j => v[j]));
    },
getNowTime() {
      var now = new Date();
      var year = now.getFullYear(); //得到年份
      var month = now.getMonth(); //得到月份
      var date = now.getDate(); //得到日期
      var hh = now.getHours() < 10 ? "0" + now.getHours() : now.getHours();
      var mm =
        now.getMinutes() < 10 ? "0" + now.getMinutes() : now.getMinutes();
      var ss =
        now.getSeconds() < 10 ? "0" + now.getSeconds() : now.getSeconds();
      month = month + 1;
      month = month.toString().padStart(2, "0");
      date = date.toString().padStart(2, "0");
      var defaultDate = `${year}-${month}-${date} ${hh}:${mm}:${ss}`;
      return defaultDate;
    },