前端导出EXCEL当前功能的使用场景用于，特定的前端json数据通过xlsx/file-saver/script-loa

效果为：

下文我们讲述的是，json数据导出excel文件，很简单

1. 核心代码

/*
 * @Author: Null
 * @Date: 2021-11-11 10:02:57
 * @Description: 导出excel方法
 */
import { Message } from 'element-ui'

const exportExcel = {
  /**
   * @description: Excel导表方法封装
   * @param {tHeader  表格第一行标题  array<string>     ['吸粉公众号', '吸粉数', '日期']}
   * @param {data     过滤处理的数据  array[]}
   * @param {lastRow  表格自定义最后一行 array<string>}
   * @param {title    导出表格文件的标题 string}
   */
  exportExcel: function (dataObj) {
    const { tHeader, data, lastRow, title } = dataObj
    return new Promise(resolve => {
      require.ensure([], () => {
        const { export_json_to_excel } = require('../utils/Excel/Export2Excel.js') // 注意这个Export2Excel路径
        data[data.length] = lastRow // 在导表的最后一行加入总数
        export_json_to_excel(tHeader, data, title) // 最后一个是表名字
        resolve(true)
      })
    })
  },

  /**
   * @description: Excel数据过滤数据方法，例如时间格式
   * @param {过滤键值} filterVal
   * @param {过滤数据} jsonData
   * @return {返回对应的数据}
   */
  formatJson: function (filterVal, jsonData) {
    return jsonData.map(v => filterVal.map(j => v[j]))
  },

  /**
   * @description: 导出excel表
   * @param {表格数据} data
   * @param {表头数据 ，现在只适用一级表头， string[] , 例如['时间', '吸粉数'],} tHeader
   * @param {表格列数据，必须与表头相对应，string[] , 例如['time', 'number']} filterVal
   * @param {表格行数据 object[] } tableData
   * @param {导出表格的文件标题， string} title
   * @param {可自定义最后一行数据， string[] ，注意其长度最好是与表头相对应 } lastRow
   * @return {*}
   */
  exportExcelFun: function (data) {
    // console.log('导柱形图excel表数据', data)
    const that = this
    // 请求后端接口拿到list数据
    if (data.tableData.length !== 0) {
      const dataObj = {
        tHeader: data.tHeader,
        filterVal: data.filterVal,
        lastRow: data.lastRow || [],
        title: data.title || 'downLoadExcel',
        data: function () {
          // 这里存在一个this指针指向的问题
          return that.formatJson(data.filterVal, data.tableData)
        }
      }
      // console.log('dataObj.data()', dataObj.data())
      dataObj.data = dataObj.data() // 过滤函数立即执行，返回对应的表格数据
      that.exportExcel(dataObj).then(res => {
        if (res) {
          // console.log('下载Excel成功！')
          Message.success(`文件名为${dataObj.title}的Excel表格导出成功！`)
        } else {
          Message.error(`文件名为${dataObj.title}的Excel表格导出失败！`)
        }
      })
    } else {
      Message.warning('请选择对应的数据！')
    }
  }
}

export default exportExcel

2. /utils/Excel 下的文件

依赖安装

// 生产依赖
"xlsx": "^0.17.4",
"file-saver": "^2.0.5",

// 开发依赖
"script-loader": "^0.7.2",

使用npm安装：

npm install -S file-saver xlsx（这里其实安装了2个依赖）

npm install -D script-loader

使用yarn安装：【注意要先安装file-saver , 再安装xlsx ; xlsx先一步安装不会成功的】

yarn add file-saver

yarn add xlsx

yarn add script-loader -D

Export2Excel.js

/*
 * @Author: Null
 * @Date: 2021-11-11 10:02:22
 * @Description: excel导出js文件
 */

/* eslint-disable */
require('script-loader!file-saver');
require('./Blob.js');//转二进制用  这边要写你的blob的实际地址
require('script-loader!xlsx/dist/xlsx.core.min');
 
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")
};

Bolb.js 文件

/* 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));

3. 补充

node-xlsx 【nodeJs生成excel，基于基本库的封装，底层的库是用的xlsx。】

npm安装： npm install node-xlsx

导出excel，npm文档：www.npmjs.com/package/nod，

参考文档：blog.csdn.net/weixin_4610…

js-xlsx

npm 安装： npm install xlsx-style --save

官方文档：www.npmjs.com/package/js-…

xlsx-style 基于xlsx封装的样式库，可以在xlsx的基础上设置样式。

npm 安装： npm install xlsx-style --save

npm 文档：www.npmjs.com/package/xls…

【补充】这里再解释一下node-xlsx和xlsx的关系。首先node-xlsx是对xlsx的封装，简化了一些操作（这是我们在node项目里使用它比较重要的原因）但是由于xlsx库没有对样式做处理，所以有人又在xlsx的基础上封装了样式，也就是xlsx-style库。js-xlsx和xlsx。xlsx和js-xlsx可以理解为基本库，API十分复杂，上手难度高，但是你想要的功能，基本上都有。但是文档不好，看起来十分费力。 xlsx文档：www.npmjs.com/package/xls…