模仿 https://github.com/PanJiaChen/vue-element-admin/ 的下载

创建文件夹vendor 创建文件 Export2Excel.js

内容：

/* eslint-disable */

require('script-loader!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,

bookType= 'xlsx'

} = {}) {

/* 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) {

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}`);

}

安装包    "xlsx": "^0.11.16"

"file-saver": "^2.0.0",

"script-loader": "^0.7.2",

onClickBtnExportX(datas){

let that = this;

if (!datas|| datas.length<=0) {

that.$message('请先选择要导出的数据！')

return

}

import('@/vendor/Export2Excel').then(excel => {

const tHeader = ['进口报关单号','报关单号', '报关编号','类型名称', '车队系统名称', '车身编号'

, '发动机号码','后备发动机号码','数量','报关日期', '运输公司', '单据日期', '货品类型编号','经办人','审核状态','运输方式'];

const filterVal = ['customsOrderNum','customsOrderNum', 'customsClearCode', 'type', 'fleetSystemName', 'carBodyNum','engineNum'

, 'backupEngineNum', 'account', 'customsClearDate', 'tranCompany'

, 'listDate', 'typeCode', 'manager', 'orderStatus', 'transMode'];

const fileName = parseTime(new Date(),'{y}-{m}-{d}')+"_" + datas[0].customsOrderNum;

const data = this.formatJson(filterVal, datas)

excel.export_json_to_excel({

header: tHeader,

data,

filename: fileName

})

})

},

formatJson(filterVal, jsonData) {

return jsonData.map(v => filterVal.map(j => {

if (j === 'customsClearDate'|| j === 'listDate') {

return parseTime(v[j])

}else if(j === 'orderStatus'){

debugger

if (v[j]===true) {

v[j]="审批通过";

}else if(v[j]===false){

v[j]="审批不通过";

}else {

v[j]="未审批";

}

return v[j]

} else {

return v[j]

}

}))

},