vue导出excel并修改样式

1.首先安装以下三个安装包

npm install --save xlsx(修改样式需要下载npm install --save xlsx-style)
npm install -S file-saver
npm install -D script-loader
注意：如果安装了npm install --save xlsx-style
会报错：This relative module was not found: ./cptable in ./node_modules/xlsx-style@0.8.13@xlsx-style/dist/cpexcel.js

可以直接修改源码：
在\node_modules\xlsx-style\dist\cpexcel.js 807行 的 var cpt = require(’./cpt’ + ‘able’); 改成 var cpt = cptable;

也可以在项目vue.config.js 文件中添加

module.exports = {
  lintOnSave: false,
  css: {
    loaderOptions: {
      sass: {
        data: `@import "~@/styles/variables.scss";`
      }
    }
  },  
  chainWebpack: config => {
  //在 chainWebpack 添加下面的一段代码
    config.externals({ "./cptable": "var cptable" });**
  },
  devServer: {}
};

2. 需要下载一个Blob.js　(放在src 目录下)
3. 新建一个Export2Excel.js

//这是从网上的，改了一点点 Export2Excel.js
/* eslint-disable */
/* eslint-disable */
require("script-loader!file-saver");
import XLSX from "xlsx-style";

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;
}

function export_json_to_excel({
  title,
  multiHeader = [],
  header,
  data,
  filename,
  merges = [],
  autoWidth = true,
  bookType = "xlsx"
} = {}) {
  // const merges = [`A1:${getCharCol(list.length - 2)}1`]; //合并单元格
  /* original data */
  filename = filename || "excel-list";
  data = [...data];

  data.unshift(header);
  if (title) {
    data.unshift(title);
  }
  for (let i = multiHeader.length - 1; i > -1; i--) {
    data.unshift(multiHeader[i]);
  }
  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: 13
          };
        } 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
          };
        }
      })
    );
    // console.log(colWidth);
    /*以第一行为初始值*/
    let result = colWidth[0];
    colWidth[0][0]["wch"] = 13;
    // console.log(colWidth[0][0]["wch"]);
    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 dataInfo = wb.Sheets[wb.SheetNames[0]];

  // const borderAll = {
  //   //单元格外侧框线
  //   top: {
  //     style: "thin"
  //   },
  //   bottom: {
  //     style: "thin"
  //   },
  //   left: {
  //     style: "thin"
  //   },
  //   right: {
  //     style: "thin"
  //   }
  // };
  //给所以单元格加上边框
  // for (var i in dataInfo) {
  //   if (i == '!ref' || i == '!merges' || i == '!cols' || i == 'A1') {

  //   } else {
  //     dataInfo[i + ''].s = {
  //       border: borderAll
  //     }
  //   }
  // }

  // 标题行
  let arr = [
    "A1",
    "B1",
    "C1",
    "D1",
    "E1",
    "F1",
    "G1",
    "H1",
    "I1",
    "J1",
    "K1",
    "L1",
    "M1",
    "N1",
    "O1",
    "P1",
    "Q1",
    "R1",
    "S1",
    "T1",
    "U1",
    "V1",
    "W1",
    "X1",
    "Y1",
    "Z1"
  ];
  // arr.some(function(v) {
  //   let a = merges[0].split(":");
  //   if (v == a[1]) {
  //     dataInfo[v].s = {};
  //     return true;
  //   } else {
  //     dataInfo[v].s = {};
  //   }
  // });
  //设置主标题样式
  let style = {
    font: {
      // name: "宋体",
      // sz: 18,
      color: { rgb: "000000" },
      bold: true
      // italic: false,
      // underline: false
    },
    alignment: {
      horizontal: "center",
      vertical: "center"
    }

    // fill: {
    //   fgColor: {rgb: "008000"},
    // },
  };

  // dataInfo["B1"].s = style;
  // dataInfo["A1"].s = style;

  //excel标题样式
  for (var i = 0; i < header.length; i++) {
    dataInfo[arr[i]].s = style;
  }
  var wbout = XLSX.write(wb, {
    bookType: bookType,
    bookSST: false,
    type: "binary"
  });
  saveAs(
    new Blob([s2ab(wbout)], {
      type: "application/octet-stream"
    }),
    `${filename}.${bookType}`
  );
}
function toExportExcel(tHeader, data, filename) {
  import("@/excel/Export2Excel").then(excel => {
    //表头对应字段

    excel.export_json_to_excel({
      header: tHeader,
      data: data,
      filename: filename,
      autoWidth: true,
      bookType: "xlsx"
    });
  });
}
export { toExportExcel, export_json_to_excel };

//util.js
import "@/excel/Blob";

export { json2excel, getCharCol, formatJson };

// function parseTime(time, cFormat) {
//   if (arguments.length === 0) {
//     return null;
//   }
//   const format = cFormat || "{y}-{m}-{d} {h}:{i}:{s}";
//   let date;
//   if (typeof time === "object") {
//     date = time;
//   } else {
//     if (typeof time === "string" && /^[0-9]+$/.test(time)) {
//       time = parseInt(time);
//     }
//     if (typeof time === "number" && time.toString().length === 10) {
//       time = time * 1000;
//     }
//     date = new Date(time);
//   }
//   const formatObj = {
//     y: date.getFullYear(),
//     m: date.getMonth() + 1,
//     d: date.getDate(),
//     h: date.getHours(),
//     i: date.getMinutes(),
//     s: date.getSeconds(),
//     a: date.getDay()
//   };
//   // eslint-disable-next-line
//   const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
//     let value = formatObj[key];
//     // Note: getDay() returns 0 on Sunday
//     if (key === "a") {
//       return ["日", "一", "二", "三", "四", "五", "六"][value];
//     }
//     if (result.length > 0 && value < 10) {
//       value = "0" + value;
//     }
//     return value || 0;
//   });
//   // eslint-disable-next-line
//   return time_str;
// }

function json2excel(tableJson, filenames, autowidth, bookTypes) {
  import("@/excel/Export2Excel").then(excel => {
    var tHeader = [];
    var dataArr = [];
    var sheetnames = [];
    for (var i in tableJson) {
      tHeader.push(tableJson[i].tHeader);
      dataArr.push(formatJson(tableJson[i].filterVal, tableJson[i].tableDatas));
      sheetnames.push(tableJson[i].sheetName);
    }
    excel.export_json_to_excel({
      header: tHeader,
      data: dataArr,
      sheetname: sheetnames,
      filename: filenames,
      autoWidth: autowidth,
      bookType: bookTypes
    });
  });
}
// 数据过滤，时间过滤
function formatJson(filterVal, jsonData) {
  return jsonData.map(v =>
    filterVal.map(j => {
      if (j === "timestamp") {
        return parseTime(v[j]);
      } else {
        return v[j];
      }
    })
  );
}

// 获取26个英文字母用来表示excel的列
function getCharCol(n) {
  for (var i = 0; i < this.list.length; i++) {
    this.list[i].showActive = false;
    if (index == i) {
      this.list[index].showActive = true;
    }
  }

  let temCol = "",
    s = "",
    m = 0;
  while (n > 0) {
    m = (n % 26) + 1;
    s = String.fromCharCode(m + 64) + s;
    n = (n - m) / 26;
  }
  return s;
}

用法

<div @click="exportExcel">下载短信模板</div>

import { formatJson } from "@/util.js";
import { toExportExcel } from "@/excel/Export2Excel";
export default {
  data() {
    return {
      //表格的数据
      list: [
        {
          name: "蓝叶子",
          phone: 18955191234,
          content:
            "第一个为前置条件，最后一个为预期结果，需要带相应关键字,第一个为前置条件，最后一个为预期结果"
        },
        {
          name: "蓝叶子",
          phone: 18955191234,
          content: "第一个为前置条件，最后一个为预期结果，需要带相应关键字"
        },
        {
          name: "蓝叶子",
          phone: "18955191234",
          content:
            "第一个为前置条件，最后一个为预期结果，需要带相应关键字,zhenhgdsdfsff"
        },
        {
          name: "蓝叶子",
          phone: 18955191234,
          content: "第一个为前置条件，最后一个为预期结果，需要带相应关键字"
        },
        {
          name: "蓝叶子",
          phone: "18955191234",
          content:
            "第一个为前置条件，最后一个为预期结果，需要带相应关键字,zhenhgdsdfsff"
        },
        {
          name: "蓝叶子",
          phone: 18955191234,
          content: "第一个为前置条件，最后一个为预期结果，需要带相应关键字"
        },
        {
          name: "蓝叶子",
          phone: "18955191234",
          content:
            "第一个为前置条件，最后一个为预期结果，需要带相应关键字,zhenhgdsdfsff"
        }
      ]
    };
  },
  methods: {
    exportExcel() {
      const filterVal = [];
      const list = this.list.map((item, index) => {
        if (index === 0) {
          for (var k in item) {
            filterVal.push(k);
          }
        }
        return {
          name: item.name,
          phone: +item.phone, //转成number
          content: item.content
        };
      });
      const tHeader = ["姓名", "手机号", "内容"]; //表头
      const data = formatJson(filterVal, list);
      const filename = "短信模板";

      toExportExcel(tHeader, data, filename);
    }
  }
};