前端导出表格,万级数据,带样式(留自用)

普通excel 导出

1.下载插件 (推荐版本xlsx0.16.0)

//建议安装 0.16.3 的xlsx，高版本的好像会有问题 "file-saver": "^2.0.2", "xlsx": "^0.16.3"

npm install -S file-saver
npm install xlsx@0.16.0 -S
npm install -D script-loader

2.导入三个js文件

在src目录下新建utils文件夹，里面放入Blob.js和Export2Excel.js和dateUtil.js三个JS文件

3.mian.js(两个js文件再文章末尾)

import Blob from './utils/Blob'

import Export2Excel from './utils/Export2Excel.js'

4.导出

html:


<el-button class="purple el-icon-upload2" @click="exportExcel()">导出</el-button>

js:

注: 当前表格为复选表格,所以对复选进行了相应判断

//引入  注意Export2Excel路径
import { export_json_to_excel } from '../../../utils/Export2Excel';
import dateUtil from '../../../utils/dateUtil'// 导出exportExcel() {const tHeader = ["竞赛名称", "竞赛开始时间","竞赛结束时间","得分","排名","获得奖项","指导老师","指导老师获得奖项"]; //对应表格输出的titleconst filterVal = ["rname", "starttime","endtime","mark","type","sprizename","teacher","tprizename"]; // 对应表格输出的数据let that = this;this.$confirm('确定要导出吗？', '提示', {type: 'warning'}).then(() => {// console.log(this.multipleSelection,'---');// 如果选择数据为空 发送请求 取全部数据if(this.multipleSelection == undefined || this.multipleSelection == '') {  //total为后端返回数据总条数,直接赋值给当前页面请求条数即可this.form.pagesize = this.pageTotal  //this.query为请求需要携带的参数this.query = this.form  //schoollist为封装后的请求schoollist(this.query).then(res => {that.exportData = res.retData.data;//为循环数据添加一个序号 导出后方便查看for(let i in that.exportData){that.exportData[i].type = parseInt(i)+1}const data = that.formatJson(filterVal, that.exportData);export_json_to_excel(tHeader, data, '人员历史参赛' + dateUtil.gettime() + '系统导出');//最后一个是表名字//请求完成后将页码归为正常请求值that.form.pagesize = 10});}else {//如果此时复选框有数据,直接导出选中数据即可this.exportData = this.multipleSelectionconst data = that.formatJson(filterVal, this.exportData);export_json_to_excel(tHeader, data, '人员历史参赛' + dateUtil.gettime() + '系统导出');//最后一个是表名字 //导出完成后,清除复选框数据this.$refs.table.clearSelection()this.multipleSelection = []}// console.log('导出数据',this.exportData);}).catch(()=>{})},
formatJson(filterVal, jsonData) {   return jsonData.map(v => filterVal.map(j => v[j]))    },

5.导出万级数据(普通一次性导出失败,需要对请求进行处理)

思路: 和普通导出一样只不过是将请求分批次发送, 再服务器可接收的范围内即可

由于等待时间过长,需要加入loading图,此时可以将loading进行封装,方便其他页面使用

5-1 loading组件

可以将其放到公用的文件夹中

<template><div class="loading"><div><img class="loadimg" src="../../assets/img/loading.gif" alt=""><p class="loadtext">正在导出中,请稍后</p></div></div>
</template><script>
export default {name: 'Loading' // 定义的组件名称 使用时写法：loading
}
</script><style scoped>.loading {/* background: rgba(0,0,0,.3);position: fixed;top: 70px;right: 0;width: 83.4%;height: 100%;padding-top: 18%;z-index: 1000; */display: flex;justify-content: center;align-items: center;background: rgba(0,0,0,.3);position: absolute;top: 0;right: 0;width: 100%;height: 100%;z-index: 10;
}
.loadimg {margin: auto;width: 44px;display: block;
}
.loadtext {line-height: 32px;/* color: #2c3e50; */color: #FCFCFC;
}
</style>

5-2.当前页面引入loading

//html
<!-- 加载loading --><div id="loading"><Loading ref='loading' v-if="loading"></Loading></div>
//jsimport Loading from '../../common/loading.vue'     //loading图export default {components:{Loading,},data() {return {loading:false,}}
}

5-3 发起数据请求导出excel

重复之前步骤

引入需要的插件

//html:
<el-button class="purple el-icon-upload2" @click="exportdownload()">导出</el-button>
//js:
import { export_json_to_excel } from '../../../utils/Export2Excel';
import dateUtil from '../../../utils/dateUtil'
//事件 前提同样是复选表格 所以进行判断
//判断默认全部导出还是选择后部分导出exportdownload() {let that = this;this.$confirm('确定要导出吗？', '提示', {type: 'warning'}).then(() => {//未选择数据 默认导出全部if(this.multipleSelection.length == 0) {   this.form.pagenum = 0 //数据处理this.handleData()}else {// 取选中数据that.exportData = this.multipleSelection//导出数据this.dload(that.exportData)//清空复选框this.$refs.table.clearSelection()this.multipleSelection = []}}).catch(()=>{})},
// 导出handleData() {let that = this;that.loading = true//设置每次请求条数为5000 可承受范围内that.form.pagesize = 5000that.form.pagenum++ that.query = this.formquestionbank(that.query).then(res => {that.exportData = res.retData.data;that.exportData.forEach(item => {//对数据进行相应处理item.audstatus = item.audstatus == 0 ? '未确认' :item.audstatus==1 ?'已确认' :'已驳回';item.sourceid = item.sourceid == 1 ? '公众' :item.sourceid== 2 ?'录入':item.sourceid== 3 ?'邀请':'';//后端返回数据为每次请求数据,不会累计叠加,需要手动push到一个新数组that.downdata.push(item)})//  console.log(that.downdata,'data');// console.log(this.form.pagenum)//此时对请求进行判断,如果当前页小于总页数 (总条数/发送的条数)则继续发送请求,重新调用当前请求if(this.form.pagenum < Math.ceil(this.pageTotal / 5000)) {// this.handleData()setTimeout(() => {this.handlepData()}, 5000);}else {//请求完毕后进入到次处,可以进行下一步操作this.dload(that.downdata)//导出后 刷新当前页 数据回归原值this.form.pagenum = 1this.form.pagesize = 5this.getData()}});},
//导出数据处理
dload(downdata) {const tHeader = ["领域", "题型","题形","题目","选项","答案","解析","正确率","难度","适应人群","一级类","二级类","三级类","出题人","审核人","日期","备注",]; //对应表格输出的titleconst filterVal = ["fieldname", "type","topic","title","opt","answer","analysis","acc",'difficulty',"crowd","firstname","secondname","thirdname","author","checker","createtime","remark",]; // 对应表格输出的数据let that = this;const data = that.formatJson(filterVal, downdata);export_json_to_excel(tHeader, data, '题库管理' + dateUtil.gettime() + '系统导出');//最后一个是表名字this.loading = false},formatJson(filterVal, jsonData) {   return jsonData.map(v => filterVal.map(j => v[j]))    },

6.导出带样式的万级数据的表格

再前两个xlsx和file-saver的基础上,追加一个插件

npm install xlsx-style -S

安装后出现报错:

将var cpt = require('./cpt' + 'able'),替换成 var cpt = cptable,其他错误可能也是这个地方造成的

引入插件

import XLSX from 'xlsx'
import XLSXS from 'xlsx-style'
import FileSaver from 'file-saver'

<!-- html 定义点击事件 -->
<el-button class="el-icon-upload2"  @click="exportExcelAll()" type="primary" >全部导出</el-button>
<!-- 加载loading --><Loading ref='loading' v-if="loading"></Loading>
//引入loading组件 即将使用的导出样式插件import Loading from '../../common/loading.vue'     //loading图import XLSX from "xlsx";import XLSXS from 'xlsx-style';import FileSaver from 'file-saver';import dateUtil from '../../../utils/dateUtil';// 导出全部 定义即将轮询的条件exportExcelAll() {this.num = 1  //页面初始值为1this.filename = ''  //请求携带的参数this.loading = true    //等待效果开启this.showall()},
//数据处理showall() {this.query = {step:12,scheid:this.id,//赛程idnum:this.num,size:4000,}// console.log(this.query,'quey');raceresult(this.query).then(res => {if(res.retCode === '0000') {this.allData = res.retData// console.log(this.allData);if(this.num < this.allData.totalpage) {this.num++this.exportData = this.exportData.concat(res.retData.filename)this.showall()}else {this.exportData = this.exportData.concat(res.retData.filename)let contentWs = XLSX.utils.json_to_sheet(this.exportData, {//表头对应字段设置skipHeader: true, // 是否忽略表头,默认为falseorigin: "A1",//表头起始行，默认从'A1'开始，也就是Excel左上角第一个表格});                        // 单独设置某个单元格内容//获取后端返回对象的所有下标与值let bgVal = Object.values(contentWs);let bgKey = Object.keys(contentWs);for(let i=0;i<bgVal.length;i++) {//数据处理 根据后端实际返回进行处理if(bgKey[i] != '!ref') {let smaVal = Object.values(bgVal[i]);let smaKey = Object.keys(bgVal[i]);for(let j=0;j<smaVal.length;j++) {  contentWs[smaKey[j]] = {t:"s",v: smaVal[j].value,//单元格文字s:{fill: { fgColor: { rgb: smaVal[j].bg }      //单元格背景色},}}    } } }let len = Object.keys(contentWs).length-2;let startTable = Object.keys(contentWs)[0];let endTable = Object.keys(contentWs)[len];//处理数据后一定要加 !ref 要不内容为空 !refA1:*1contentWs["!ref"] = startTable+":"+endTablethis.handleData(contentWs)}}else {console.log('请求失败');}})},
// 导出表格handleData(ws) {let wb = XLSX.utils.book_new();XLSX.utils.book_append_sheet(wb, ws, "人员列表");let wbout = XLSXS.write(wb, {type: "buffer",});// // 下载FileSaver.saveAs(new Blob([wbout]),//   // 设置导出文件名称"人员列表"+ dateUtil.gettime() + "系统导出");this.loading = false;},

js文件:

dateUtil.js

export default {gettime() {let date = new Date();//时间戳为10位需*1000，时间戳为13位的话不需乘1000let y = date.getFullYear();let MM = date.getMonth() + 1;MM = MM < 10 ? ('0' + MM) : MM;//月补0let d = date.getDate();d = d < 10 ? ('0' + d) : d;//天补0let h = date.getHours();h = h < 10 ? ('0' + h) : h;//小时补0let m = date.getMinutes();m = m < 10 ? ('0' + m) : m;//分钟补0let s = date.getSeconds();s = s < 10 ? ('0' + s) : s;//秒补0return y + '-' + MM + '-' + d + ' ' + h + ':' + m+ ':' + s;}
}

excport2Excel.js


//Export2Excel.js
/* 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 rangesranges.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 Spanif (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 ValueoutRow.push(cellValue !== "" ? cellValue : null);//Handle Colspanif (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")
};
// 导出多个sheet
export function export2ExcelMultiSheet(jsonData, defaultTitle) {let data = jsonData;//添加标题for (let item of data) {item.data.unshift(item.th);}let wb = new Workbook();//生成多个sheetfor (let item of data) {wb.SheetNames.push(item.sheetTitle)wb.Sheets[item.sheetTitle] = sheet_from_array_of_arrays(item.data);}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")
}

Blob.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 BlobBuildervar BlobBuilder = view.BlobBuilder || view.WebKitBlobBuilder || view.MozBlobBuilder || (function(view) {varget_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) {vartype = 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 stringif (Uint8Array && (data instanceof ArrayBuffer || data instanceof Uint8Array)) {varstr = "", 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 syncthrow 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 stringbb.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));