[JavaScript知识库]vue 树形表格导出excel

实现效果

需求

可以结合element表格直接导出excel，也可以用于树形表格或者树形结构的数据导出excel

安装依赖

npm install file-saver xlsx --save

npm install script-loader --save

需要文件

由于我用的vite构建的项目，无法使用require导入文件，因此使用的是import导入js文件

在src文件夹下建立一个文件夹，命名为vendor,并建立两个js文件，分别命名为Blob,Export2Excel

下面有两个文件的代码，也可以直接从百度网盘下载两个文件的资源
百度网盘文件下载链接
提取码：mn88

Blob:作用为处理二进制

/* 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(/^\[object\s(.*)\]$/)[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;
        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));

Export2Exceljs文件代码如下

可以自己研究一下，是将数组转换为execl

/* 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")
}

export function export_json_to_excel({
                                         header,
                                         data,
                                         filename,
                                         autoWidth = true
                                     } = {}) {
    /* original data */
    filename = filename || 'excel-list'
    data = [...data]
    data.unshift(header);
    var ws_name = "SheetJS";
    var wb = new Workbook(),
        ws = sheet_from_array_of_arrays(data);

    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 || val === ' ' || val === 0.0) {
                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: 'xlsx',
        bookSST: false,
        type: 'binary'
    });
    saveAs(new Blob([s2ab(wbout)], {
        type: "application/octet-stream"
    }), filename + ".xlsx");
}

vue页面组件

<template>
  <el-button @click="handleDownload">导出excel</el-button>
</template>

<script lang="ts">
// 引入js文件
import {export_json_to_excel} from '@/vendor/Export2Excel'

export default defineComponent({
  data(){
    return {
      tableData: [
        {
          "noticeId":123443,
          "satName":"SAd",
          "country":"Ami",
          "freqMin":11230.0,
          "freqMax":1123450.0,
          "beamInfoList":
              [
                {
                  "beamName":"SAd",
                  "freqMin":11230.0,
                  "freqMax":1123450.0,
                  "groupInfoList":
                      [
                        {
                          "groupId":11230,
                          "freqMin":10950.0,
                          "freqMax":1123450.0,
                          "pwrMax":0.0
                        },
                        {
                          "groupId":11230,
                          "freqMin":10950.0,
                          "freqMax":1123450.0,
                          "pwrMax":0.0
                        },
                        {
                          "groupId":10950,
                          "freqMin":1123450.0,
                          "freqMax":11230.0,
                          "pwrMax":0.0
                        }
                      ]
                },
              ]
        },
      ],
      excelData:[],
    }
  },
  methods:{
      // 导出excel文件
    handleDownload() {
      this.downloadLoading = true
      this.excelData = []
      import('@/vendor/Export2Excel').then(excel => {
          //这边放excel的头部信息
        const tHeader = ['noticeId',  'satName','country','freqMin','freqMax','beamName','beam_freqMin','beam_freqMax'
          ,'groupId','group_freqMin','group_freqMax','group_pwrMax'] 
       //这边是excel头部信息对应的字段
        const filterVal = ['noticeId',  'satName','country','freqMin','freqMax','beamInfoList','beamName','groupInfoList'
          ,'groupId','pwrMax']
        const list = this.tableData
        this.formatJson(filterVal, list,0)
        excel.export_json_to_excel({
          header: tHeader,
          data: this.excelData,
          filename: 'excel名称',
          autoWidth: true
        })
      })
    },
      // indent代表excel需要缩进的字段
    formatJson(filterVal, jsonData,indent) {
      jsonData.map((v, index) => {
        let tempArr = []
        // 根据indent在每一行进行缩进
        for(let i = 0;i<indent;i++){
          tempArr.push(' ')
        }
        filterVal.map(j => {
          if (v[j]) {
            if (j != 'beamInfoList' && j != 'groupInfoList') {
              if (j === 'date') {
                tempArr.push(v[j].replace(/T/g, ' '))
              } else {
                tempArr.push(v[j])
                console.log(v[j])
              }
            }
            else if(j === 'beamInfoList'){
              //如果有children进行递归
              this.excelData.push(tempArr)
              tempArr = []
              this.formatJson(filterVal, v.beamInfoList,5)
            }
            else if(j === 'groupInfoList'){
                //如果有children进行递归
              this.excelData.push(tempArr)
              tempArr = []
              this.formatJson(filterVal, v.groupInfoList,8)
            }
          }
        });
        if(tempArr.length !== 0){
          this.excelData.push(tempArr)
        }
      });
    },
  }

})
</script>