前端导出 excel（基于 Blob.js 和 Export2Excel.js 做前端导出）
作者：CRMEB
- 2022 年 6 月 06 日
本文字数：7905 字
阅读完需：约 26 分钟
安装依赖
npm install -S file-savernpm install -S xlsxnpm install -D script-loader
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也可以使用 cnpm 安装，在此区分一下 npm -i 与 npm install -s 与 - d 的区别 npm i module_name -g 全局安装，i 是 install 的简写-S 就是–save 的简写-D 就是–save-dev 这样安装的包的名称及版本号就会存在 package.json 的 devDependencies 这个里面，而–save 会将包的名称及版本号放在 dependencies 里面。
我们在使用 npm install 安装模块或插件的时候，有两种命令把他们写入到 package.json 文件里面去，比如：
–save-dev–save
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在 package.json 文件里面提现出来的区别就是，使用 --save-dev 安装的 插件，被写入到 devDependencies 对象里面去，而使用 --save 安装的插件，是被写入到 dependencies 对象里面去。那么 package.json 文件里面的 devDependencies 和 dependencies 对象有什么区别呢？
devDependencies 里面的插件只用于开发环境，不用于生产环境，而 dependencies 是需要发布到生产环境的。
下载导入 Blob.js 和 Export2Excel.js
将在 Export2Excel.js 中引用其他 js 文件的时候，一开始在这一步踩过坑。
require('script-loader!file-saver'); //保存文件用require('script-loader!vendor/Blob'); //转二进制用require('script-loader!xlsx/dist/xlsx.core.min'); //xlsx核心
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这样引入在项目运行的时候会报一个错，
This dependency was not found:* script-loader!vendor/Blob in ./src/vendor/Export1Excel.jsTo install it, you can run: npm install --save script-loader!vendor/Blob
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后来找到的解决方法是下载 blob.js 文件，将 blob.js 与 Export2Excel.js 放在同一个文件夹下，并将引用方式改为如下。
require('script-loader!file-saver'); //保存文件用require('./Blob.js'); //转二进制用require('script-loader!xlsx/dist/xlsx.core.min'); //xlsx核心
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这样就不会报错了，Export2Excel.js 的完整代码如下：
require('script-loader!file-saver'); //保存文件用require('./Blob.js'); //转二进制用require('script-loader!xlsx/dist/xlsx.core.min'); //xlsx核心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")}
function formatJson(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")}复制代码
Blob.js 文件可以在 gitHub 下载，地址如下，也可以在此直接复制
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));
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封装一个方法方便调用
下图是我的文件目录结构，将新建的 newToExcel.js 放在 utils 文件夹下，Blob.js 和 Export2Excel.js 放在 vendor 文件夹下
newToExcel.js 代码如下：
import { export_json_to_excel } from '../vendor/Export2Excel'
/*** @method exportExcel* @param {Array} header 表头* @param {Array} filterVal 表头属性字段* @param {String} filename 文件名称* @param {Array} tableData 列表数据**/export default function exportExcel(header, filterVal, filename, tableData) { var data = formatJson(filterVal, tableData) export_json_to_excel( header, data, filename )}
function formatJson(filterVal, tableData) { return tableData.map(v => { return filterVal.map(j => { return v[j] }) })}复制代码
在页面中执行导出。
在需要执行导出的页面，先引入 newToExcel.js
import exportExcel from "@/utils/newToExcel.js";
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然后去请求 api 中的数据，将数据组装成可以执行的格式
async exports() { //exports方法为导出按钮点击事件 let [th, filekey, data, fileName] = [[], [], [], ""]; let lebData = await this.getExcelData(); //表格主要数据，通过下面的方法接收 if (!fileName) fileName = '商品统计表'; //文件名 if (!filekey.length) { filekey = lebData.filekey; } if (!th.length) th = lebData.header; //表头 data = data.concat(lebData.exportData); exportExcel(th, filekey, fileName, data); //导出数据的核心方法},getExcelData(excelData) { return new Promise((resolve, reject) => { productTrendApi({dateLimit:this.dateLimitPram}).then(res=>{ let header = ['日期/时间','浏览量','新增商品数量','收藏量','加购件数','下单商品数','交易成功商品数']; //设置表头 let filekey = ['date','pageView','addProductNum','collectNum','addCartNum','orderProductNum','orderSuccessProductNum']; //设置表头对应的key值 let exportData = new Array(); exportData = res.map((item)=>{ return { date:item.date, pageView:item.pageView, addProductNum:item.addProductNum, collectNum:item.collectNum, addCartNum:item.addCartNum, orderProductNum:item.orderProductNum, orderSuccessProductNum:item.orderSuccessProductNum } }) resolve({header,filekey,exportData}); //将上面的数据转为 Promise 对象 }) });},复制代码
源码附件已经打包好上传到百度云了，大家自行下载即可～
链接: https://pan.baidu.com/s/14G-bpVthImHD4eosZUNSFA?pwd=yu27提取码: yu27复制代码
百度云链接不稳定，随时可能会失效，大家抓紧保存哈。
如果百度云链接失效了的话，请留言告诉我，我看到后会及时更新～
开源地址
码云地址：http://github.crmeb.net/u/defu
Github 地址：http://github.crmeb.net/u/defu
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