前端如何实现生成excel文件，并下载

后端很忙没有实现配合，主要由前端来实现，需要点击下载模版生成一个excel并下载的功能，

这是格式

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<a href="javascript:void(0)"@click="downloadTemplate">下载模板</a>

import * as XLSX from "xlsx";

const downloadTemplate = async () => {
	const data = [
		["编号"],
		["1650000008818"],
		["1650000009224"],
		["1650000009118"],
	];
	// excel导出
	const sheet = XLSX.utils.aoa_to_sheet(data);
	const book = XLSX.utils.book_new();
	XLSX.utils.book_append_sheet(book, sheet, "sheet1"); // 生成sheet

	// 设置行宽
	const rowNum = data.length - 1;
	sheet["!cols"] = [];
	for (let i = 0; i < rowNum; i++) {
		sheet["!cols"].push({ wpx: 100 });
	}
	// 导出样式需要用到xlsx-style，所有没有表格样式
	XLSX.writeFile(book, `模版.xlsx`); // 导出
};

也可以多列数据，这个暂时用不到

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const data = [
		["编号", "姓名"],
		["1650000008818", "zs"],
		["1650000009224", "ls"],
		["1650000009118", "ww"],
];

另外如果数据是json格式，这里没有用到

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const json = [
		{
			问题: "1",
			答案: "2",
		},
];

	// 将json数据转换成excel文件
const worksheet = XLSX.utils.json_to_sheet(json);
const workbook = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(workbook, worksheet, "Sheet1");

上传文件后，前端读取上传的excel

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<el-upload
			:http-request="uploadHttpRequest"
			action="#"
			:limit="1"
			:auto-upload="true"
			ref="upload"
			:on-success="fileSuccess"
			:on-change="fileChange"
			:data="fileData"
			:on-remove="fileRemove"
			drag
			:accept="acceptFile"
			:file-list="fileList"
		>
			<div class="el-icon-upload">
				<svg
					t="1724643479911"
					class="icon"
					viewBox="0 0 1024 1024"
					version="1.1"
					xmlns="http://www.w3.org/2000/svg"
					p-id="4294"
					width="48"
					height="48"
				>
					<path
						d="M1024 693.248q0 25.6-8.704 48.128t-24.576 40.448-36.864 30.208-45.568 16.384l1.024 1.024-17.408 0-4.096 0-4.096 0-675.84 0q-5.12 1.024-16.384 1.024-39.936 0-74.752-15.36t-60.928-41.472-40.96-60.928-14.848-74.752 14.848-74.752 40.96-60.928 60.928-41.472 74.752-15.36l1.024 0q-1.024-8.192-1.024-15.36l0-16.384q0-72.704 27.648-137.216t75.776-112.128 112.128-75.264 136.704-27.648 137.216 27.648 112.64 75.264 75.776 112.128 27.648 137.216q0 37.888-8.192 74.24t-22.528 69.12q5.12-1.024 10.752-1.536t10.752-0.512q27.648 0 52.736 10.752t43.52 29.696 29.184 44.032 10.752 53.76zM665.6 571.392q20.48 0 26.624-4.608t-8.192-22.016q-14.336-18.432-31.744-48.128t-36.352-60.416-38.4-57.344-37.888-38.912q-18.432-13.312-27.136-14.336t-25.088 12.288q-18.432 15.36-35.84 38.912t-35.328 50.176-35.84 52.224-36.352 45.056q-18.432 18.432-13.312 32.768t25.6 14.336l16.384 0q9.216 0 19.968 0.512t20.992 0.512l17.408 0q14.336 1.024 18.432 9.728t4.096 24.064q0 17.408-0.512 30.72t-0.512 25.6-0.512 25.6-0.512 30.72q0 7.168 1.536 15.36t5.632 15.36 12.288 11.776 21.504 4.608l23.552 0q9.216 0 27.648 1.024 24.576 0 28.16-12.288t3.584-38.912q0-23.552 0.512-42.496t0.512-51.712q0-23.552 4.608-36.352t19.968-12.8q11.264 0 32.256-0.512t32.256-0.512z"
						p-id="4295"
						fill="#e6e6e6"
					></path>
				</svg>
			</div>
			<div class="el-upload__text">
				将文件拖到此处，或<em>点击上传</em>
			</div>
			<div class="el-upload__tip" slot="tip">
				支持格式为xls、xlsx，文件大小不超过1MB
				<a
					class="ls-upload__tip-link"
					href="javascript:void(0)"
					@click="downloadTemplate"
					>下载模板</a
				>
			</div>
		</el-upload>

getExcelData(val) {
			const file = val;
			const reader = new FileReader();
			reader.onload = (ev) => {
				const data = ev.target.result;
				const workbook = XLSX.read(data, { type: "binary" });
				const sheetName = workbook.SheetNames[0];
				const sheetData = XLSX.utils.sheet_to_json(
					workbook.Sheets[sheetName],
					{ header: 1 }
				);
				// 过滤掉汉字or null
				this.sheetData = sheetData
					.map((i) => i[0])
					.filter((i) => i && !/[\u4e00-\u9fa5]/.test(i));
			};
			reader.readAsBinaryString(file);
},
uploadHttpRequest(params) {
	this.getExcelData(params.file);
			
},

本页全部代码

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<template>
	<CommonDialog
		@open="dialogOpen"
		ref="dialog"
		:title="title"
		size="tiny"
		:buttonList="buttonList"
		@save="save"
		@cancel="cancel"
	>
		<el-upload
			:http-request="uploadHttpRequest"
			action="#"
			:limit="1"
			:auto-upload="true"
			ref="upload"
			:on-success="fileSuccess"
			:on-change="fileChange"
			:data="fileData"
			:on-remove="fileRemove"
			drag
			:accept="acceptFile"
			:file-list="fileList"
		>
			<div class="el-icon-upload">
				<svg
					t="1724643479911"
					class="icon"
					viewBox="0 0 1024 1024"
					version="1.1"
					xmlns="http://www.w3.org/2000/svg"
					p-id="4294"
					width="48"
					height="48"
				>
					<path
						d="M1024 693.248q0 25.6-8.704 48.128t-24.576 40.448-36.864 30.208-45.568 16.384l1.024 1.024-17.408 0-4.096 0-4.096 0-675.84 0q-5.12 1.024-16.384 1.024-39.936 0-74.752-15.36t-60.928-41.472-40.96-60.928-14.848-74.752 14.848-74.752 40.96-60.928 60.928-41.472 74.752-15.36l1.024 0q-1.024-8.192-1.024-15.36l0-16.384q0-72.704 27.648-137.216t75.776-112.128 112.128-75.264 136.704-27.648 137.216 27.648 112.64 75.264 75.776 112.128 27.648 137.216q0 37.888-8.192 74.24t-22.528 69.12q5.12-1.024 10.752-1.536t10.752-0.512q27.648 0 52.736 10.752t43.52 29.696 29.184 44.032 10.752 53.76zM665.6 571.392q20.48 0 26.624-4.608t-8.192-22.016q-14.336-18.432-31.744-48.128t-36.352-60.416-38.4-57.344-37.888-38.912q-18.432-13.312-27.136-14.336t-25.088 12.288q-18.432 15.36-35.84 38.912t-35.328 50.176-35.84 52.224-36.352 45.056q-18.432 18.432-13.312 32.768t25.6 14.336l16.384 0q9.216 0 19.968 0.512t20.992 0.512l17.408 0q14.336 1.024 18.432 9.728t4.096 24.064q0 17.408-0.512 30.72t-0.512 25.6-0.512 25.6-0.512 30.72q0 7.168 1.536 15.36t5.632 15.36 12.288 11.776 21.504 4.608l23.552 0q9.216 0 27.648 1.024 24.576 0 28.16-12.288t3.584-38.912q0-23.552 0.512-42.496t0.512-51.712q0-23.552 4.608-36.352t19.968-12.8q11.264 0 32.256-0.512t32.256-0.512z"
						p-id="4295"
						fill="#e6e6e6"
					></path>
				</svg>
			</div>
			<div class="el-upload__text">
				将文件拖到此处，或<em>点击上传</em>
			</div>
			<div class="el-upload__tip" slot="tip">
				支持格式为xls、xlsx，文件大小不超过1MB
				<a
					class="el-upload__tip-link"
					href="javascript:void(0)"
					@click="downloadTemplate"
					>下载模板</a
				>
			</div>
		</el-upload>
	</CommonDialog>
</template>
<script>
// import { jbneplmsMsDp } from "@/api";
// import axios from "axios";
import * as XLSX from "xlsx";
import { downloadTemplate } from "@/utils/downloadExcel.js";
const params = () => {
	return {
		fileList: [],
	};
};

export default {
	data() {
		return {
			title: "",
			buttonList: [
				{
					name: "取消",
					methods: "cancel",
				},
				{
					name: "上传",
					methods: "save",
				},
			],
			fileList: [],
			acceptFile: ".xls,.xlsx",
			fileData: {},
			params: params(),
			sheetData: [],
		};
	},
	methods: {
		downloadTemplate() {
			const data = [
				["发电户编号"],
				["1650000008818"],
				["1650000009224"],
				["1650000009118"],
			];
			downloadTemplate(data);
		},
		getExcelData(val) {
			const file = val;
			const reader = new FileReader();
			reader.onload = (ev) => {
				const data = ev.target.result;
				const workbook = XLSX.read(data, { type: "binary" });
				const sheetName = workbook.SheetNames[0];
				const sheetData = XLSX.utils.sheet_to_json(
					workbook.Sheets[sheetName],
					{ header: 1 }
				);
				// 过滤掉汉字or null
				this.sheetData = sheetData
					.map((i) => i[0])
					.filter((i) => i && !/[\u4e00-\u9fa5]/.test(i));
			};
			reader.readAsBinaryString(file);
		},
		uploadHttpRequest(params) {
			this.getExcelData(params.file);
			// const that = this;
			// const formData = new FormData();
			// formData.append("file", params.file);
			// for (let key in this.fileData) {
			// 	formData.append(key, this.fileData[key]);
			// }
			// axios
			// 	.post(
			// 		"/jbneplms-ms-dp/acqPowerCust/getPowerCustElecListByFile",
			// 		formData,
			// 		{ headers: { "Content-Type": "multipart/form-data" } }
			// 	)
			// 	.then((res) => {
			// 		// console.log(res.data.data, ">>>>>>>>>>");
			// 		that.$emit("update", res.data.data);
			// 		that.$refs.dialog.handleClose();
			// 	});
		},
		dialogOpen() {
			this.fileList = [];
		},
		open(data) {
			this.fileList = [];
			this.title = data.title || "导入";
			if (data.obj) {
				this.fileData = data.obj;
			}
			this.$refs.dialog.handleOpen();
		},
		cancel() {
			this.$refs.dialog.handleClose();
		},
		save() {
			if (this.fileList.length == 0) {
				this.$message.warning("请上传文件");
			} else {
				const uniqueArr = this.sheetData.filter(
					(item, index) => this.sheetData.indexOf(item) === index
				);
				// this.$refs.upload.submit();
				const maxL = this.sheetData.length;
				const minL = uniqueArr.length;
				console.log(maxL, minL);
				if (minL < maxL) {
					this.$message.warning(
						`有${
							maxL - minL
						}条发电户信息重复，已合并信息去除重复发电户`
					);
				}
				if (maxL == 0) {
					this.$message.warning("导入数据无效，请重新导入");
					return;
				}
				this.$emit("updateFile", uniqueArr);
				this.cancel();
			}
		},
		fileChange(file, fileList) {
			this.fileList = fileList;
			let type = file.name.slice(file.name.lastIndexOf("."));
			if (this.acceptFile.indexOf(type) == -1) {
				this.$message.warning(`请上传${this.acceptFile}类型的文件`);
				this.fileList.pop();
			} else if (file.size > 1 * 1024 * 1024) {
				this.$message.warning(`文件大小不超过1MB`);
				this.fileList.pop();
			}
		},
		fileRemove(file, fileList) {
			this.fileList = fileList;
		},
		fileSuccess(res, file, fileList) {
			// console.log(res, ">>>>>>>>");
			this.params.fileList.push(res.data);
		},
	},
};
</script>
<style lang="less" scoped>
.top {
	display: flex;
	align-items: center;
	justify-content: space-between;
	margin-bottom: 13px;
	.name {
		white-space: nowrap;
	}
}
/deep/.ms-upload {
	width: 100%;
}
/deep/.ms-upload-dragger {
	width: 100%;
}
.el-icon-upload {
	margin-top: 60px;
}
.el-upload__text {
	margin-top: 20px;
}
.el-upload__tip-link {
	display: block;
	color: rgb(0, 153, 204);
	font-size: 14px;
}
</style>