vue导出excel文件，并且修改复杂表头的方法实例xlsx-style

1.导入

npm install file-saver -S 
npm install xlsx -S
npm install -D script-loader

（如果后续有问题提示Can‘t resolve ‘***‘ in，请移步点我一下）
2.在一个空白文件夹下创建两个文件

Blob.js

/* eslint-disable */
/* Blob.js*/
 
/*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(/^\[object\s(.*)\]$/)[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
 
            , origin = /^[\w-]+:\/*\[?[\w\.:-]+\]?(?::[0-9]+)?/
        ;
        FakeBlob.fake = FB_proto.fake = true;
        while (file_ex_code--) {
            FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1;
        }
        // Polyfill URL
        if (!real_URL.createObjectURL) {
            URL = view.URL = function (uri) {
                var
                    uri_info = document.createElementNS("http://www.w3.org/1999/xhtml", "a")
                    , uri_origin
                ;
                uri_info.href = uri;
                if (!("origin" in uri_info)) {
                    if (uri_info.protocol.toLowerCase() === "data:") {
                        uri_info.origin = null;
                    } else {
                        uri_origin = uri.match(origin);
                        uri_info.origin = uri_origin && uri_origin[1];
                    }
                }
                return uri_info;
            };
        }
        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 = 0;
            delete this.data;
        };
        return FakeBlobBuilder;
    }(view));
 
    view.Blob = function (blobParts, options) {
        var type = options ? (options.type || "") : "";
        var builder = new BlobBuilder();
        if (blobParts) {
            for (var i = 0, len = blobParts.length; i < len; i++) {
                if (Uint8Array && blobParts[i] instanceof Uint8Array) {
                    builder.append(blobParts[i].buffer);
                }
                else {
                    builder.append(blobParts[i]);
                }
            }
        }
        var blob = builder.getBlob(type);
        if (!blob.slice && blob.webkitSlice) {
            blob.slice = blob.webkitSlice;
        }
        return blob;
    };
 
    var getPrototypeOf = Object.getPrototypeOf || function (object) {
        return object.__proto__;
    };
    view.Blob.prototype = getPrototypeOf(new view.Blob());
}(
    typeof self !== "undefined" && self
    || typeof window !== "undefined" && window
    || this
));

Export2Excel.js

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

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")
}
// 使用复杂表头的关键是，对此方法进行修改，如下：
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}`);
}

3.main.js下引入两个文件

 import Blob from '../../static/excel/js/Blob.js'
 import Export2Excel from '../../static/excel/js/Export2Excel.js'

4.导出数据----页面button

导出数据

5.在页面上引入需要的组件

import { saveAs } from "file-saver";
import XLSX from "xlsx";

6.对应的方法exportData

// 导出数据
    exportData() {
      let that = this;
      // 导出
      // 懒加载，@/common/vendor/Export2Excel 此路径为本地路径
      import("../../../../static/excel/js/Export2Excel.js").then(excel => {
        const multiHeader = [
          [
            "成绩输出数据列表",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            ""
          ]
        ];
        const multiHeader2 = [
          [
            "用户名",
            "登录名",
            "战队",
            "试题1",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "试题2",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "试题3",
            "",
            "",
            "",
            "",
            "",
            "",
            "",
            "试题4",
            "",
            "",
            "",
            "",
            "",
            "",
            ""
          ]
        ];
        const tHeader = [
          "",
          "",
          "",
          "试题",
          "设备配置项得分",
          "数据配置项得分",
          "小区得分",
          "小区切换得分",
          "小区漫游得分",
          "客观分数",
          "主观分数",
          "试题",
          "设备配置项得分",
          "数据配置项得分",
          "小区得分",
          "小区切换得分",
          "小区漫游得分",
          "客观分数",
          "主观分数",
          "试题",
          "设备配置项得分",
          "数据配置项得分",
          "小区得分",
          "小区切换得分",
          "小区漫游得分",
          "客观分数",
          "主观分数",
          "试题",
          "设备配置项得分",
          "数据配置项得分",
          "小区得分",
          "小区切换得分",
          "小区漫游得分",
          "客观分数",
          "主观分数"
        ];
        const filterVal = [
          "userName",
          "loginName",
          "teamName",
          "e1Name",
          "d1eqScore",
          "d1dataScore",
          "d1villScore",
          "d1switchScore",
          "d1roamScore",
          "d1Score",
          "d1Dyfield1",
          "e2Name",
          "d2eqScore",
          "d2dataScore",
          "d2villScore",
          "d2switchScore",
          "d2roamScore",
          "d2Score",
          "d2Dyfield1",
          "e3Name",
          "d3eqScore",
          "d3dataScore",
          "d3villScore",
          "d3switchScore",
          "d3roamScore",
          "d3Score",
          "d3Dyfield1",
          "e4Name",
          "d4eqScore",
          "d4dataScore",
          "d4villScore",
          "d4switchScore",
          "d4roamScore",
          "d4Score",
          "d4Dyfield1"
        ]; // 表头所对应的字段，这里未填写
        let officeId = "";
        if (that.officeId != "187" && that.officeId != "") {
          officeId = that.officeId;
        }
        let params = {
          loginName: that.loginName,
          examName: that.examName,
          officeId: officeId
        };
        api
          .exportXfScoreList(params) //请求成绩列表的api
          .then(function(res) {
            let jsonData = res;
            const data = that.formatJson(filterVal, jsonData);
            // 进行所有表头的单元格合并
            const merges = [
              "A1:AI",
              "A2:A3",
              "B2:B3",
              "C2:C3",
              "D2:K2",
              "L2:S2",
              "T2:AA2",
              "AB2:AI2",
              "D3:D3",
              "E3:E3",
              "F3:F3",
              "G3:G3",
              "H3:H3",
              "I3:I3",
              "J3:J3",
              "K3:K3",
              "L3:L3",
              "M3:M3",
              "N3:N3",
              "O3:O3",
              "P3:P3",
              "Q3:Q3",
              "R3:R3",
              "S3:S3",
              "T3:T3",
              "U3:U3",
              "V3:V3",
              "W3:W3",
              "X3:X3",
              "Y3:Y3",
              "Z3:Z3",
              "AA3:AA3",
              "AB3:AB3",
              "AC3:AC3",
              "AD3:AD3",
              "AE3:AE3",
              "AF3:AF3",
              "AG3:AG3",
              "AH3:AH3",
              "AI3:AI3"
            ];
            excel.export_json_to_excel({
              multiHeader, // 这里是第一行的表头
              multiHeader2, // 这里是第二行的表头
              header: tHeader, // 这里是第三行的表头
              data,
              filename: "成绩输出数据列表",
              merges
            });
          })
          .catch(function(err) {
            console.log(JSON.stringify(err));
          });
      });
    },
    formatJson(filterVal, jsonData) {
      jsonData.map((row, index) => {
        row.index = index + 1;
      });
      return jsonData.map(v =>
        filterVal.map(j => {
          return v[j];
        })
      );
    },

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