vue-导出excel

需求：导出含有多级表头的Excel表

步骤
1.安装插件--
  npm install -S file-saver
  npm install -S xlsx
  npm install -D script-loader
  cnpm install --save xlsx-style  --样式
2.创建一个文件夹---创建Bolb.js 、Export2Excel.js

/* eslint-disable */
/* Blob.js
 * A Blob implementation.
 * 2014-05-27
 *
 * By Eli Grey, http://eligrey.com
 * By Devin Samarin, https://github.com/eboyjr
 * License: X11/MIT
 * See LICENSE.md
 */

/*global self, unescape */
/*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true,
 plusplus: true */

/*! @source http://purl.eligrey.com/github/Blob.js/blob/master/Blob.js */

(function (view) {
  "use strict";

  view.URL = view.URL || view.webkitURL;

  if (view.Blob && view.URL) {
    try {
      new Blob;
      return;
    } catch (e) {}
  }

  // Internally we use a BlobBuilder implementation to base Blob off of
  // in order to support older browsers that only have BlobBuilder
  var BlobBuilder = view.BlobBuilder || view.WebKitBlobBuilder || view.MozBlobBuilder || (function(view) {
    var
      get_class = function(object) {
        return Object.prototype.toString.call(object).match(/^[objects(.*)]$/)[1];
      }
      , FakeBlobBuilder = function BlobBuilder() {
        this.data = [];
      }
      , FakeBlob = function Blob(data, type, encoding) {
        this.data = data;
        this.size = data.length;
        this.type = type;
        this.encoding = encoding;
      }
      , FBB_proto = FakeBlobBuilder.prototype
      , FB_proto = FakeBlob.prototype
      , FileReaderSync = view.FileReaderSync
      , FileException = function(type) {
        this.code = this[this.name = type];
      }
      , file_ex_codes = (
        "NOT_FOUND_ERR SECURITY_ERR ABORT_ERR NOT_READABLE_ERR ENCODING_ERR "
        + "NO_MODIFICATION_ALLOWED_ERR INVALID_STATE_ERR SYNTAX_ERR"
      ).split(" ")
      , file_ex_code = file_ex_codes.length
      , real_URL = view.URL || view.webkitURL || view
      , real_create_object_URL = real_URL.createObjectURL
      , real_revoke_object_URL = real_URL.revokeObjectURL
      , URL = real_URL
      , btoa = view.btoa
      , atob = view.atob

      , ArrayBuffer = view.ArrayBuffer
      , Uint8Array = view.Uint8Array
    ;
    FakeBlob.fake = FB_proto.fake = true;
    while (file_ex_code--) {
      FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1;
    }
    if (!real_URL.createObjectURL) {
      URL = view.URL = {};
    }
    URL.createObjectURL = function(blob) {
      var
        type = blob.type
        , data_URI_header
      ;
      if (type === null) {
        type = "application/octet-stream";
      }
      if (blob instanceof FakeBlob) {
        data_URI_header = "data:" + type;
        if (blob.encoding === "base64") {
          return data_URI_header + ";base64," + blob.data;
        } else if (blob.encoding === "URI") {
          return data_URI_header + "," + decodeURIComponent(blob.data);
        } if (btoa) {
          return data_URI_header + ";base64," + btoa(blob.data);
        } else {
          return data_URI_header + "," + encodeURIComponent(blob.data);
        }
      } else if (real_create_object_URL) {
        return real_create_object_URL.call(real_URL, blob);
      }
    };
    URL.revokeObjectURL = function(object_URL) {
      if (object_URL.substring(0, 5) !== "data:" && real_revoke_object_URL) {
        real_revoke_object_URL.call(real_URL, object_URL);
      }
    };
    FBB_proto.append = function(data/*, endings*/) {
      var bb = this.data;
      // decode data to a binary string
      if (Uint8Array && (data instanceof ArrayBuffer || data instanceof Uint8Array)) {
        var
          str = ""
          , buf = new Uint8Array(data)
          , i = 0
          , buf_len = buf.length
        ;
        for (; i < buf_len; i++) {
          str += String.fromCharCode(buf[i]);
        }
        bb.push(str);
      } else if (get_class(data) === "Blob" || get_class(data) === "File") {
        if (FileReaderSync) {
          var fr = new FileReaderSync;
          bb.push(fr.readAsBinaryString(data));
        } else {
          // async FileReader won't work as BlobBuilder is sync
          throw new FileException("NOT_READABLE_ERR");
        }
      } else if (data instanceof FakeBlob) {
        if (data.encoding === "base64" && atob) {
          bb.push(atob(data.data));
        } else if (data.encoding === "URI") {
          bb.push(decodeURIComponent(data.data));
        } else if (data.encoding === "raw") {
          bb.push(data.data);
        }
      } else {
        if (typeof data !== "string") {
          data += ""; // convert unsupported types to strings
        }
        // decode UTF-16 to binary string
        bb.push(unescape(encodeURIComponent(data)));
      }
    };
    FBB_proto.getBlob = function(type) {
      if (!arguments.length) {
        type = null;
      }
      return new FakeBlob(this.data.join(""), type, "raw");
    };
    FBB_proto.toString = function() {
      return "[object BlobBuilder]";
    };
    FB_proto.slice = function(start, end, type) {
      var args = arguments.length;
      if (args < 3) {
        type = null;
      }
      return new FakeBlob(
        this.data.slice(start, args > 1 ? end : this.data.length)
        , type
        , this.encoding
      );
    };
    FB_proto.toString = function() {
      return "[object Blob]";
    };
    FB_proto.close = function() {
      this.size = this.data.length = 0;
    };
    return FakeBlobBuilder;
  }(view));

  view.Blob = function Blob(blobParts, options) {
    var type = options ? (options.type || "") : "";
    var builder = new BlobBuilder();
    if (blobParts) {
      for (var i = 0, len = blobParts.length; i < len; i++) {
        builder.append(blobParts[i]);
      }
    }
    return builder.getBlob(type);
  };
}(typeof self !== "undefined" && self || typeof window !== "undefined" && window || this.content || this));

/* eslint-disable */
require('script-loader!file-saver');
require('script-loader!./Blob');
require('script-loader!xlsx/dist/xlsx.core.min');
 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(th, jsonData, defaultTitle) {
    /* original data */

    var data = jsonData;
    data.unshift(th);
    var ws_name = 'SheetJS';

    var wb = new Workbook(),
        ws = sheet_from_array_of_arrays(data);

    /* 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' });
    var title = defaultTitle || '列表';
    saveAs(new Blob([s2ab(wbout)], { type: 'application/octet-stream' }), title + '.xlsx');
}
//导出带有多级表头的Excel
export function export_json_to_mul_excel({
    headerLen = 4, //一共几级表头
    multiHeader = [], //第一行表头
    multiHeader2 = [], //第二行表头
    multiHeader3 = [], //第三行表头
    header,
    data,
    filename,
    merges = [],
    autoWidth = true,
    bookType = 'xlsx'
} = {}) {
    /* original data */
    filename = filename || 'excel-list';
    data = [...data];
    //此处是第三行行表头
    data.unshift(header);
    if (multiHeader3.length > 0) {
        for (let i = multiHeader3.length - 1; i > -1; i--) {
            data.unshift(multiHeader3[i]);
        }
    }
    //此处是第二行表头
    if (multiHeader2.length > 0) {
        for (let i = multiHeader2.length - 1; i > -1; i--) {
            data.unshift(multiHeader2[i]);
        }
    }
    //此处是第一行行表头
    if (multiHeader.length > 0) {
        for (let i = multiHeader.length - 1; i > -1; i--) {
            data.unshift(multiHeader[i]);
        }
    }

    // data.unshift(th);
    var ws_name = 'SheetJS';

    var wb = new Workbook(),
        ws = sheet_from_array_of_arrays(data);

    // 表头合并
    if (merges.length > 0) {
        if (!ws['!merges']) ws['!merges'] = [];
        merges.forEach(item => {
            ws['!merges'].push(XLSX.utils.decode_range(item));
        });
    }

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

    //设置Excel表头和内容的格式
    setExcelStyle(wb, multiHeader, headerLen);

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

function setExcelStyle(wb, multiHeader, headerLen) {
    let dataInfo = wb.Sheets[wb.SheetNames[0]];
    // console.log('dataInfo', dataInfo);
    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' || i == 'A1') {
        } else {
            dataInfo[i + ''].s = {
                //border: borderAll,
                alignment: {
                    horizontal: 'left',
                    vertical: 'center'
                },
                font: {
                    name: '微软雅黑',
                    sz: 10
                }
            };
        }
    }

    // 设置表格样式
    const arrabc_base = [
        'A',
        'B',
        'C',
        'D',
        'E',
        'F',
        'G',
        'H',
        'I',
        'J',
        'K',
        'L',
        'M',
        'N',
        'O',
        'P',
        'Q',
        'R',
        'S',
        'T',
        'U',
        'V',
        'W',
        'X',
        'Y',
        'Z',
    ];
    const arrabc_repeat=['','A','B','C','D']
    let arrabc=[]
    for(let i=0;i<arrabc_repeat.length;i++){
        for(let j=0;j<arrabc_base.length;j++){
            arrabc.push(arrabc_repeat[i]+arrabc_base[j])
        }
    }
   
    const fontName = '微软雅黑';
    const rbgColor = 'f2f2f2';

    //字体格式
    //第一行标题字体
    const commonFontHead = {
        name: fontName,
        sz: 16,
        color: {
            rgb: '666666'
        },
        bold: true
    };
    //第二行标题字体
    const commonFontHead2 = {
        name: fontName,
        sz: 14,
        color: {
            rgb: '666666'
        },
        bold: true
    };
    //第三行标题字体
    const commonFontHead3 = {
        name: fontName,
        sz: 12,
        color: {
            rgb: '666666'
        },
        bold: true
    };
    //普通标题字体
    const commonFont = {
        name: fontName,
        sz: 10,
        color: {
            rgb: '333333'
        },
        bold: true
    };
    //对其格式
    const commonAlignment = {
        horizontal: 'center',
        vertical: 'center'
    };
    //背景填充格式
    const commonFill = {
        fgColor: {
            rgb: rbgColor
        }
    };

    // 给标题、表格描述信息、表头等部分加上特殊格式
    arrabc.some(function(v) {
        for (let j = 1; j < multiHeader.length + headerLen; j++) {
            const _v = v + j;
            if (dataInfo[_v]) {
                dataInfo[_v].s = {};

                // 标题部分A1-Z1
                if (j == 1) {
                    dataInfo[v + j].s = {
                        border: borderAll,
                        font: commonFontHead,
                        alignment: commonAlignment,
                        fill: commonFill
                    };
                } else {
                    // 表头部分,根据表头特殊格式设置
                    if (multiHeader.length == 0) {
                        // multiHeader.length = 0 时表头没有合并单元格，表头只占1行A2-Z2
                        const fv = v + (multiHeader.length + 2);
                        dataInfo[fv].s = {
                            border: borderAll,
                            font: commonFontHead2,
                            alignment: commonAlignment,
                            fill: commonFill
                        };
                    } else if (multiHeader.length == 1) {
                        // multiHeader.length = 0 时表头有合并单元格，表头只占2行A2-Z2，A3-Z3，这是没有描述信息只有表头合并的
                        dataInfo[v + j].s = {
                            border: borderAll,
                            font: commonFontHead3,
                            alignment: commonAlignment,
                            fill: commonFill
                        };
                    } else {
                        // multiHeader.length = 0 时表头有合并单元格，表头多行
                        dataInfo[v + j].s = {
                            border: borderAll,
                            font: commonFont,
                            alignment: {
                                horizontal: 'left',
                                vertical: 'center'
                            }
                        };
                    }
                }
                //第三行的表头格式
                if (headerLen > 2) {
                    // multiHeader.length + 2 是表头的最后1行
                    if( dataInfo[v + (multiHeader.length + 2)]!=null){
                        dataInfo[v + (multiHeader.length + 2)].s = {
                            border: borderAll,
                            font: commonFont,
                            alignment: commonAlignment,
                            fill: commonFill
                        };
                    }
                   
                }
                //第四行的表头格式
                if (headerLen > 3) {
                    if( dataInfo[v + (multiHeader.length + 3)]!=null){
                        dataInfo[v + (multiHeader.length + 3)].s = {
                            border: borderAll,
                            font: commonFont,
                            alignment: commonAlignment,
                            fill: commonFill
                        };
                    }
                }
            }
        }
    });
}

在Export2Excel.js 文件中参考了网上文档添加了可以支持多级表头和表头格式的方法 export_json_to_mul_excel

如果需要对表头进行样式修改，就必须在Export2Excel中添加样式文件引入  

import XLSX from 'xlsx-style';

3.导出方法的调用

在需要导出的Vue页面引入导出方法：

import { export_json_to_mul_excel } from '../../../../utils/vendor/Export2Excel.js';

测试用例：

 excel2ExcelTest(){
        require.ensure([], () => {
            // const { export_json_to_excel } = require('vendor/Export2Excel');
            const multiHeader = [
                [
                    '序号',
                    'title 1',
                    '',
                    '',
                    '',
                    '',
                    '',
                    '',
                    '',
                ]
            ];
            const multiHeader2 = [
                [
                    '',
                    'title 2-1',
                    '',
                    '',
                    '',
                    'title 2-2',
                    '',
                    '',
                    '',
                   
                ]
            ];
            const multiHeader3 = [
                [
                    '',
                    'title 3-1',
                    '',
                    'title 3-2',
                    '',
                    'title 3-3',
                    '',
                    'title 3-4',
                    '',
                ]
            ];
            const tHeader = [
                '',
                '姓名',
                '性别',
                '身高',
                '体重',
                '年龄',
                '电话',
                '身份证号码',
                '住址',
               
            ];
            const filterVal = [
                'index',
                'name',
                'sex',
                'height',
                'weight',
                'age',
                'phone_no',
                'id_card_no',
                'address',
               
            ];
             const excelData = [{
                 index:1,
                 name:'张三',
                 sex:'男',
                 height:'175',
                 weight:'120',
                 age:'30',
                 phone_no:'13612345678',
                 id_card_no:'3123199508081244',
                 address:'上海浦东'

             }];

            const data = this.formatJson(filterVal, excelData);
            const merges = [
                'A1:A4',
                'B1:I1',
                'B2:E2',
                'F2:I2',
                'B3:C3',
                'D3:E3',
                'F3:G3',
                'H3:I3',
            ];
            const headerLen = 4;
            export_json_to_mul_excel({
                headerLen, //一共多少级表头
                multiHeader, //这里是第一行的表头
                multiHeader2, //这里是第二行的表头
                multiHeader3, //这里是第三行的表头
                header: tHeader, //这里应该是算第四行的表头
                data,
                filename:'report',
                merges
            });
        });
    },

导出测试用例主要使用的参数为一级、二级、三级、四级表头、需要导出的数据、需要合并的表头数据

导出结果：

附上一份参考文档：

https://blog.csdn.net/weixin_43965143/article/details/106572755