在vue3项目中使用xlsx插件实现Excel表格的导出和解析

1、xlsx插件包官方 xlsx插件包官方
2、FileReader官方文档：FileReader官方文档

安装xlsx和xlsx-style-vite、file-saver

npm install xlsx
npm install xlsx-style-vite
npm install file-saver

package.json中查看安装版本

在utils文件夹下新建excel.js

import { saveAs } from "file-saver";

export function exportExcel(
  ids,
  filename,
  excelProps,
  excelList,
  dictOptions = {}
) {

  const newExcelProps = JSON.parse(JSON.stringify(excelProps));
  import("@/utils/export2Excel").then((excel) => {
    // 顺序表按值删除
    for (var i = newExcelProps.length - 1; i >= 0; i--) {
      if (
        newExcelProps[i].visible === false ||
        newExcelProps[i].field === "operation"
      ) {
        newExcelProps.splice(i, 1);
      }
    }
    const propLength = newExcelProps.length;
    const title = [filename];

    const tHeader = newExcelProps.map((item) => item[name]); // 表头
    // 需要过滤的导出表头
    const toRemove = ["操作"];
    const filterHeader = tHeader.filter((item) => !toRemove.includes(item));
    tHeader.length = 0;
    tHeader.push(...filterHeader);
    // 如果ids为空或者undefined导出默认的数据，否则筛选数据
    let fileData;
    if (ids === undefined || ids.length === 0) {
      fileData = excelList;
    } else if (ids && ids.length >= 0) {
      let arr = JSON.parse(JSON.stringify(excelList));
      let arrMap = new Map(arr.map((obj) => [obj.id, obj]));
      let resultArr = ids.map((id) => arrMap.get(id));
      fileData = resultArr;
    }

    fileData.forEach((item) => {
      newExcelProps.forEach((v) => {
        // 如果props 中type为dict 且 scopedSlots存在content 则会对每行导出数据进行下拉筛选
        if (v.type === "dict" && v.scopedSlots.content) {
          let dictField = v.dictField || ["dictValue", "dictLabel"];
          const filterData = dictOptions[v.field].filter(
            (f) => item[v.field] == f[dictField[0]]
          );
          item[v.field] = !filterData.length ? "" : filterData[0][dictField[1]];
        }
      });
    });

   
    const data = Array.from(fileData, (v) =>
      newExcelProps.map(({ field }) => v[field])
    );

    //单元格值判空操作
    for (let i = 0; i < data.length; i++) {
      const item = data[i];
      for (let index = 0; index < item.length; index++) {
        item[index] =
          item[index] === "" ||
          item[index] === null ||
          item[index] === undefined
            ? ""
            : item[index];
      }
    }

    const merges = [`A1:${numToEng(propLength)}1`];
    excel.export_json_to_excel({
      title,
      header: tHeader,
      data,
      merges,
      filename,
      autoWidth: true,
      bookType: "xlsx",
    });
  });
}
// 转换英文字符
export function numToEng(num) {
  const A_Z = []
  for (let i = 65; i < 91; i++) {
    A_Z.push(String.fromCharCode(i))
  }
  return A_Z[num - 1]
}

在utils文件夹下新建export2Excel.js

/* eslint-disable */
// require("script-loader!file-saver");
import * as XLSX from "xlsx";
import * as XLSX_STYLE from "xlsx-style-vite"; // Vue3 + Vite

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_STYLE.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_STYLE.SSF._table[14];
        cell.v = datenum(cell.v);
      } else cell.t = "s";

      ws[cell_ref] = cell;
    }
  }
  if (range.s.c < 10000000) ws["!ref"] = XLSX_STYLE.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["!merges"] = ranges;

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;

  var wbout = XLSX_STYLE.write(wb, {
    bookType: "xlsx",
    bookSST: false,
    type: "binary",
  });

  saveAs(
    new Blob([s2ab(wbout)], {
      type: "application/octet-stream",
    }),
    "test.xlsx"
  );
}

// 生成器
function* generateHeaderString() {
  let index = 0;
  const letterString = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  while (true) {
    let str = "";
    let n = index;
    while (n >= 0) {
      str = letterString[n % 26] + str;
      n = Math.floor(n / 26) - 1;
    }
    yield str;
    index++;
  }
}

// 迭代生成单元格表头数组
function generateHeaderArr(length) {
  const result = [];
  const generator = generateHeaderString();
  for (let i = 0; i < length; i++) {
    const nextString = generator.next().value;
    result.push(nextString);
  }
  return result;
}

export function export_json_to_excel({
  title,
  multiHeader = [],
  header,
  data,
  filename,

  merges = [],
  autoWidth = true,
  bookType = "xlsx",
} = {}) {
  /* original data */
  filename = filename || "excel-list";
  data = [...data];
  //   data.unshift(header);
  data.unshift(title);
  for (let i = multiHeader.length - 1; i > -1; i--) {
    data.unshift(multiHeader[i]);
  }

  var ws_name = filename || "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_STYLE.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 || val == "") {
          return {
            wch: 20,
          };
        } else if (val.toString().charCodeAt(0) > 255) {
          /*再判断是否为中文*/
          return {
            wch: val.toString().length * 10,
          };
        } 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[0]["wch"] < colWidth[i][j]["wch"]) {
          result[0]["wch"] = colWidth[i][j]["wch"] + 5;
        } else {
        }
      }
    }
      result.push({ wch: 55 });
    ws["!cols"] = result;
  }

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;
  var dataInfo = wb.Sheets[wb.SheetNames[0]];

  //单元格外侧框线
  const borderAll = {
    top: {
      style: "thin",
    },
    bottom: {
      style: "thin",
    },
    left: {
      style: "thin",
    },
    right: {
      style: "thin",
    },
  };

  //给单元格加上边框
  let row = ["!ref", "!merges", "!cols"];
  for (var i in dataInfo) {
    if (row.indexOf(i) === -1) {
      dataInfo[i + ""].s = {
        border: borderAll,
        alignment: {
          horizontal: "center",
          vertical: "center",
        },
      };
    }
  }

  // 根据表头长度生成单元格列数组
  const arr = generateHeaderArr(header.length);

  // 表头加上样式
  arr.forEach((v) => {
    let v2 = v + "3";
    if (dataInfo.hasOwnProperty(v2)) {
      dataInfo[v2].s = {
        border: borderAll,
        font: {
          color: { rgb: "FFFFFF" },
          bold: false,
          italic: false,
          underline: false,
        },
        alignment: {
          horizontal: "center",
          vertical: "center",
        },
        fill: {
          fgColor: { rgb: "808080" },
        },
      };
    }
  });

  //设置主标题样式
  dataInfo["A1"].s = {
    font: {
      name: "微软雅黑",
      sz: 16,
      color: { rgb: "000000" },
      bold: false,
      italic: false,
      underline: false,
    },
    alignment: {
      horizontal: "center",
      vertical: "center",
    },
  };

  var wbout = XLSX_STYLE.write(wb, {
    bookType: bookType,
    bookSST: false,
    type: "binary",
  });
  saveAs(
    new Blob([s2ab(wbout)], {
      type: "application/octet-stream",
    }),
    `${filename}.${bookType}`
  );
}

在页面上使用

<script setup>
import Edit from "./components/Edit.vue";
import { onMounted, ref } from "vue";
import axios from "axios";
import { exportExcel } from "./utils/excel.js";
// TODO: 列表渲染
const list = ref([]);
const ids = ref([]);
const title = ref("测试导出");
const column = ref([{ field: "name" }, { field: "place" }]);
const getList = async () => {
  const res = await axios.get("/list");
  list.value = res.data;
};
const onDelete = async (id) => {
  await axios.delete("/del/&{id}");
  getList();
};
onMounted(() => getList());
// TODO: 删除功能

const editRef = ref(null);
// TODO: 编辑功能
const onEdit = (row) => {
  editRef.value.open(row);
};
// 导出
const handleExport = () => {

  exportExcel(ids.value, title.value, column.value, list.value);
};
</script>

<template>
  <div class="app">
    <el-button type="primary" @click="handleExport">导出</el-button>
    <el-table :data="list">
      <el-table-column label="ID" prop="id"></el-table-column>
      <el-table-column label="姓名" prop="name" width="150"></el-table-column>
      <el-table-column label="籍贯" prop="place"></el-table-column>
      <el-table-column label="操作" width="150">
        <template #default="{ row }">
          <el-button type="primary" link @click="onEdit(row)">编辑</el-button>
          <el-button type="danger" link @click="onDelete(row.id)"
            >删除</el-button
          >
        </template>
      </el-table-column>
    </el-table>
  </div>
  <Edit ref="editRef" @onUpdate="getList" />
</template>

<style scoped>
.app {
  width: 980px;
  margin: 100px auto 0;
}
</style>

实现效果：