首先参阅了以下文档：
https://panjiachen.gitee.io/vue-element-admin-site/zh/feature/component/excel.html#excel-%E5%AF%BC%E5%87%BA
https://blog.csdn.net/weixin_42028153/article/details/124804841
核心思想：抄一下vue-element-admin这个很棒的开源集成后台管理系统中所提供的excel功能
首先引入依赖：
npm install xlsx file-saver -S npm install script-loader -S -D
然后在utils文件夹下新增Export2Excel.js文件（也可以自己找地方建）：
/* eslint-disable */
import { saveAs } from "file-saver";
import XLSX from "xlsx";
function generateArray(table) {
console.log(XLSX);
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({
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]);
}
console.log(XLSX, "===XLSX");
var ws_name = "SheetJS";
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}`
);
}
（以上代码是vue-element-admin封装的）
然后在需要导出表格的页面上补充相关代码，首先是增加一个按钮：
<el-row type="flex" class="row-bg" justify="end">
<el-button
:loading="downloadLoading"
icon="el-icon-download"
circle
@click="handleDownload"
size="mini"
></el-button>
</el-row>
css随便写一下：
.row-bg {
padding: 8px;
background-color: #f9fafc;
}
页面效果：
methods里新增两个方法：
handleDownload() {
this.downloadLoading = true;
import("@/utils/Export2Excel").then((excel) => {
console.log(excel, "excel");
const tHeader =
this.tableHeader && this.tableHeader.map((item) => item.name);
const filterVal =
this.tableHeader && this.tableHeader.map((item) => item.id);
const list = this.tableData;
const data = this.formatJson(filterVal, list);
excel.export_json_to_excel({
header: tHeader,
data,
filename: "导出表格",
});
this.downloadLoading = false;
});
},
formatJson(filterVal, jsonData) {
return jsonData.map((v) =>
filterVal.map((j) => {
return v[j];
})
);
},
此刻点击表格右上方的下载按钮发现报错utils找不到，因此用到了第二篇参考文档：
不得不说it技术更新迭代的速度十分快，于是参照文档里的两个命令，降低相关依赖版本：
npm install --save xlsx@0.17.0 npm install --save file-saver@2.0.5
清理掉node_modules文件夹，重新下一波依赖，启动项目后，点击按钮就可以下载了：
至此，简单的表格导出功能就实现了，让我们感谢无私奉献、热爱技术的大佬们！！
如果需要导出多层表头，文档一的集成方案中也提供了，可以进行参阅学习以及COPY。