xlsx导出excel功能封装

参考：
sheetjs官网
官方文档

按需引入 xlsx 库，完全引入这个库的话还是挺大的

安装

# npm
npm install xlsx
# yarn
yarn add xlsx
# pnpm
pnpm add xlsx

封装及使用

codepen 演示

export2excel.jsApp.vue

import { utils, SSF, writeFileXLSX } 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 = 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 = SSF._table[14];
        cell.v = datenum(cell.v);
      } else cell.t = "s";

      ws[cell_ref] = cell;
    }
  }
  if (range.s.c < 10000000) ws["!ref"] = 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")
  writeFileXLSX(wb, "test.xlsx");
}

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);

  /*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: 'xlsx', bookSST: false, type: 'binary' });
  var title = defaultTitle || "excel-list";
  // saveAs(new Blob([s2ab(wbout)], { type: "application/octet-stream" }), title + ".xlsx")
  writeFileXLSX(wb, title + ".xlsx");
}

export function export_jsons_to_excel(
  th1,
  jsonData1,
  th,
  jsonData,
  defaultTitle
) {
  /* original data */

  var data = jsonData;
  data.unshift(th);
  data.unshift(jsonData1);
  data.unshift(th1);
  var ws_name = "SheetJS";

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

  /*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: 'xlsx', bookSST: false, type: 'binary' });
  var title = defaultTitle || "excel-list";
  // saveAs(new Blob([s2ab(wbout)], { type: "application/octet-stream" }), title + ".xlsx")
  writeFileXLSX(wb, title + ".xlsx");
}

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vue

<script setup>
import { ref, onMounted } from "vue";
import { export_json_to_excel } from "@/use/export2excel.js";

const tableData = ref([
  // ...
]);

const columns = [
  { label: "No.", prop: "no" },
  { label: "Code", prop: "code" },
  { label: "Name", prop: "name" },
  { label: "Gender", prop: "gender" },
  { label: "Intro", prop: "intro" }
];

function handleExport() {
  export2Excel(columns, tableData.value, "test-file");
}

/**
 * 表格导出
 *
 * @param {Array} columns 表格项列表 [{prop: 'name', label: '姓名'}, {prop: 'age', label: '年龄'}]
 * @param {Array} list 表格数据列表
 * @param {string} excelName 导出文件名
 * @param {boolean} isNestedQuery 是否分析prop，嵌套查询数据
 */
function export2Excel(columns, list, excelName, isNestedQuery = false) {
  const labels = []; // 表头 ['姓名','年龄]
  const props = []; // 属性 ['name','age']
  columns.forEach((item) => {
    labels.push(item.label);
    props.push(item.prop);
  });
  // 获取导出数据: 遍历list，获取props
  const data = list.map((row) =>
    props.map((prop) => {
      if (!isNestedQuery || prop.indexOf(".") === -1) {
        return row[prop];
      } else {
        // 嵌套查询
        let a = row;
        const key = prop.split(".");
        for (var i = 0; i < key.length; i++) {
          a = a[key[i]];
        }
        return a;
      }
    })
  );
  export_json_to_excel(labels, data, excelName);
}
</script>
<template>
  <h2>Export table to excel</h2>
  <button @click="handleExport">Export</button>
  <table><!-- ... --></table>
</template>

封装方法中包含了多种场景下导出excel文件的功能

Last updated:

xlsx导出excel功能封装 ​

安装 ​

封装及使用 ​

xlsx导出excel功能封装

安装

封装及使用