安装依赖

npm install xlsx file-saver -S

npm install script-loader -S -D

视图

					<el-button id="btn-update-row" type="primary" @click.native="exportExcel">导出</el-button>

方法

		async exportExcel() {
			const dataJson = {
				pageNum: 1,
				pageSize: 9999,
				...this.searchForm
			};
			// 后台接口返回的数据
			const res = await beforeListService(dataJson);
			const tHeader = ['Id', '企业名称'];
			// eslint-disable-next-line no-unused-vars
			const filterVal = ['id', 'organizationname'];
			const data = this.formatJson(filterVal, res.ipage.records);

			// 注 /util/Export2Excel.js 路径对应
			import('@/util/Export2Excel').then(excel => {
				excel.export_json_to_excel({
					header: tHeader, // 表头 必填
					data, // 具体数据 必填
					filename: `文件名${new Date().getTime()}`, // 非必填
					autoWidth: true, // 非必填
					bookType: 'xlsx' // 非必填
				});
			});
		},
		formatJson(filterVal, tableData) {
			return tableData.map(v => {
				return filterVal.map(j => {
					return v[j];
				});
			});
		}

/util/Export2Excel.js

/* 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 = 'Sheet';

	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({
	multiHeader = [],

	header,

	data,

	filename,

	merges = [],

	autoWidth = true,

	bookType = 'xlsx'
} = {}) {
	/* original data */

	filename = filename || 'excel-list';

	data = [...data];

	data.unshift(header);

	for (let i = multiHeader.length - 1; i > -1; i--) {
		data.unshift(multiHeader[i]);
	}

	var ws_name = 'Sheet';

	var wb = new Workbook(),
		ws = sheet_from_array_of_arrays(data);

	if (merges.length > 0) {
		if (!ws['!merges']) ws['!merges'] = [];

		merges.forEach(item => {
			ws['!merges'].push(XLSX.utils.decode_range(item));
		});
	}

	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
					};
				} else if (val.toString().charCodeAt(0) > 255) {
					/*再判断是否为中文*/
					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
	);
}