vue Export2Excel 导出文件

使用需要引入这些js

在src目录下创建一个文件(vendor)进入Blob.js和Export2Excel.js
npm install -S file-saver 用来生成文件的web应用程序
npm install -S xlsx 电子表格格式的解析器
npm install -D script-loader 将js挂在在全局下

Blob.js

/* eslint-disable */
/* Blob.js*/

/*global self, unescape */
/*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true,
  plusplus: true */

/*! @source http://purl.eligrey.com/github/Blob.js/blob/master/Blob.js */

(function (view) {
  "use strict";

  view.URL = view.URL || view.webkitURL;

  if (view.Blob && view.URL) {
    try {
      new Blob;
      return;
    } catch (e) {
    }
  }

  // Internally we use a BlobBuilder implementation to base Blob off of
  // in order to support older browsers that only have BlobBuilder
  var BlobBuilder = view.BlobBuilder || view.WebKitBlobBuilder || view.MozBlobBuilder || (function (view) {
    var
      get_class = function (object) {
        return Object.prototype.toString.call(object).match(/^[objects(.*)]$/)[1];
      }
      , FakeBlobBuilder = function BlobBuilder() {
        this.data = [];
      }
      , FakeBlob = function Blob(data, type, encoding) {
        this.data = data;
        this.size = data.length;
        this.type = type;
        this.encoding = encoding;
      }
      , FBB_proto = FakeBlobBuilder.prototype
      , FB_proto = FakeBlob.prototype
      , FileReaderSync = view.FileReaderSync
      , FileException = function (type) {
        this.code = this[this.name = type];
      }
      , file_ex_codes = (
        "NOT_FOUND_ERR SECURITY_ERR ABORT_ERR NOT_READABLE_ERR ENCODING_ERR "
        + "NO_MODIFICATION_ALLOWED_ERR INVALID_STATE_ERR SYNTAX_ERR"
      ).split(" ")
      , file_ex_code = file_ex_codes.length
      , real_URL = view.URL || view.webkitURL || view
      , real_create_object_URL = real_URL.createObjectURL
      , real_revoke_object_URL = real_URL.revokeObjectURL
      , URL = real_URL
      , btoa = view.btoa
      , atob = view.atob

      , ArrayBuffer = view.ArrayBuffer
      , Uint8Array = view.Uint8Array

      , origin = /^[w-]+:/*[?[w.:-]+]?(?::[0-9]+)?/
    ;
    FakeBlob.fake = FB_proto.fake = true;
    while (file_ex_code--) {
      FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1;
    }
    // Polyfill URL
    if (!real_URL.createObjectURL) {
      URL = view.URL = function (uri) {
        var
          uri_info = document.createElementNS("http://www.w3.org/1999/xhtml", "a")
          , uri_origin
        ;
        uri_info.href = uri;
        if (!("origin" in uri_info)) {
          if (uri_info.protocol.toLowerCase() === "data:") {
            uri_info.origin = null;
          } else {
            uri_origin = uri.match(origin);
            uri_info.origin = uri_origin && uri_origin[1];
          }
        }
        return uri_info;
      };
    }
    URL.createObjectURL = function (blob) {
      var
        type = blob.type
        , data_URI_header
      ;
      if (type === null) {
        type = "application/octet-stream";
      }
      if (blob instanceof FakeBlob) {
        data_URI_header = "data:" + type;
        if (blob.encoding === "base64") {
          return data_URI_header + ";base64," + blob.data;
        } else if (blob.encoding === "URI") {
          return data_URI_header + "," + decodeURIComponent(blob.data);
        }
        if (btoa) {
          return data_URI_header + ";base64," + btoa(blob.data);
        } else {
          return data_URI_header + "," + encodeURIComponent(blob.data);
        }
      } else if (real_create_object_URL) {
        return real_create_object_URL.call(real_URL, blob);
      }
    };
    URL.revokeObjectURL = function (object_URL) {
      if (object_URL.substring(0, 5) !== "data:" && real_revoke_object_URL) {
        real_revoke_object_URL.call(real_URL, object_URL);
      }
    };
    FBB_proto.append = function (data/*, endings*/) {
      var bb = this.data;
      // decode data to a binary string
      if (Uint8Array && (data instanceof ArrayBuffer || data instanceof Uint8Array)) {
        var
          str = ""
          , buf = new Uint8Array(data)
          , i = 0
          , buf_len = buf.length
        ;
        for (; i < buf_len; i++) {
          str += String.fromCharCode(buf[i]);
        }
        bb.push(str);
      } else if (get_class(data) === "Blob" || get_class(data) === "File") {
        if (FileReaderSync) {
          var fr = new FileReaderSync;
          bb.push(fr.readAsBinaryString(data));
        } else {
          // async FileReader won't work as BlobBuilder is sync
          throw new FileException("NOT_READABLE_ERR");
        }
      } else if (data instanceof FakeBlob) {
        if (data.encoding === "base64" && atob) {
          bb.push(atob(data.data));
        } else if (data.encoding === "URI") {
          bb.push(decodeURIComponent(data.data));
        } else if (data.encoding === "raw") {
          bb.push(data.data);
        }
      } else {
        if (typeof data !== "string") {
          data += ""; // convert unsupported types to strings
        }
        // decode UTF-16 to binary string
        bb.push(unescape(encodeURIComponent(data)));
      }
    };
    FBB_proto.getBlob = function (type) {
      if (!arguments.length) {
        type = null;
      }
      return new FakeBlob(this.data.join(""), type, "raw");
    };
    FBB_proto.toString = function () {
      return "[object BlobBuilder]";
    };
    FB_proto.slice = function (start, end, type) {
      var args = arguments.length;
      if (args < 3) {
        type = null;
      }
      return new FakeBlob(
        this.data.slice(start, args > 1 ? end : this.data.length)
        , type
        , this.encoding
      );
    };
    FB_proto.toString = function () {
      return "[object Blob]";
    };
    FB_proto.close = function () {
      this.size = 0;
      delete this.data;
    };
    return FakeBlobBuilder;
  }(view));

  view.Blob = function (blobParts, options) {
    var type = options ? (options.type || "") : "";
    var builder = new BlobBuilder();
    if (blobParts) {
      for (var i = 0, len = blobParts.length; i < len; i++) {
        if (Uint8Array && blobParts[i] instanceof Uint8Array) {
          builder.append(blobParts[i].buffer);
        }
        else {
          builder.append(blobParts[i]);
        }
      }
    }
    var blob = builder.getBlob(type);
    if (!blob.slice && blob.webkitSlice) {
      blob.slice = blob.webkitSlice;
    }
    return blob;
  };

  var getPrototypeOf = Object.getPrototypeOf || function (object) {
    return object.__proto__;
  };
  view.Blob.prototype = getPrototypeOf(new view.Blob());
}(
  typeof self !== "undefined" && self
  || typeof window !== "undefined" && window
  || this
));

Export2Excel.js

require('script-loader!file-saver')
// vue 2.6必须要使用这种载入其他js文件的方式才行
import '@/vendor/Blob'
require('script-loader!xlsx/dist/xlsx.core.min')
require('script-loader!xlsx-style/dist/xlsx.core.min')

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.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()
  var 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'
  )
}

// 主要修改此函数内的方法

export function export_json_to_excel({
  multiHeader = [],
  header,
  data,
  sheetname,
  filename,
  merges = [],
  autoWidth = true,
  bookType = 'xlsx'
} = {}) {
  /* original data */
  filename = filename || 'excel-list'
  data = [...data]

  for (var i = 0; i < header.length; i++) {
    data[i].unshift(header[i])
  }

  // data.unshift(header)

  for (let i = multiHeader.length - 1; i > -1; i--) {
    data[i].unshift(multiHeader[i])
  }

  var ws_name = sheetname
  var wb = new Workbook()
  var ws = []
  for (var j = 0; j < header.length; j++) {
    ws.push(sheet_from_array_of_arrays(data[j]))
  }

  if (merges.length > 0) {
    for (var j = 0; j < header.length; j++) {
      if (!ws[j]['!merges']) ws[j]['!merges'] = []
      merges[j].forEach(item => {
        ws[j]['!merges'].push(XLSX.utils.decode_range(item))
      })
    }
  }
  // console.log("width", autoWidth)
  if (autoWidth) {
    /* 设置worksheet每列的最大宽度*/
    var colWidth = []
    for (var k = 0; k < header.length; k++) {
      colWidth.push(
        data[k].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*/
    const result = []
    for (var k = 0; k < colWidth.length; k++) {
      result[k] = colWidth[k][0]
      for (let i = 1; i < colWidth[k].length; i++) {
        for (let j = 0; j < colWidth[k][i].length; j++) {
          if (!result[k][j]) {
            continue
          }
          if (result[k][j]['wch'] < colWidth[k][i][j]['wch']) {
            result[k][j]['wch'] = colWidth[k][i][j]['wch']
          }
        }
      }
    }
    // 分别给sheet表设置宽度
    for (var l = 0; l < result.length; l++) {
      ws[l]['!cols'] = result[l]
    }
  }

  /* add worksheet to workbook */
  for (var k = 0; k < header.length; k++) {
    wb.SheetNames.push(ws_name[k])
    wb.Sheets[ws_name[k]] = ws[k]
  }

  // 设置单元格框线
  const borderAll = {
    top: {
      style: 'thin'
    },
    bottom: {
      style: 'thin'
    },
    left: {
      style: 'thin'
    },
    right: {
      style: 'thin'
    }
  }
  for (var k = 0; k < header.length; k++) {
    var dataInfo = wb.Sheets[wb.SheetNames[k]]
    // 给所有单元格加上边框，内容居中，字体，字号
    for (var i in dataInfo) {
      if (
        i === '!ref' ||
        i === '!merges' ||
        i === '!cols' ||
        i === '!rows' ||
        i === 'A1'
      ) {

      } else {
        dataInfo[i + ''].s = {
          border: borderAll,
          alignment: {
            horizontal: 'left',
            vertical: 'left'
          },
          font: {
            name: '微软雅黑',
            sz: 10
          }
        }
      }
    }
  }
  if (merges.length > 0) {
    // 表头合并
    const titleArr = ['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']
    for (var k = 0; k < header.length; k++) {
      var dataInfo = wb.Sheets[wb.SheetNames[k]]
      titleArr.some(function(v) {
        const a = merges[k][0].split(':')
        if (v === a[1]) {
          if (!dataInfo[v]) {
            dataInfo[v] = {}
          }
          dataInfo[v].s = {}
          return true
        } else {
          if (!dataInfo[v]) {
            dataInfo[v] = {}
          }
          dataInfo[v].s = {}
        }
      })
      // 设置主标题样式
      dataInfo['A1'].s = {
        font: {
          name: '微软雅黑',
          sz: 18,
          color: { rgb: '000000' },
          bold: true,
          italic: false,
          underline: false
        },
        alignment: {
          horizontal: 'center',
          vertical: 'center'
        }
      }
    }
  }
  var wbout = XLSX.write(wb, {
    bookType: bookType,
    bookSST: false,
    type: 'binary'
  })
  saveAs(
    new Blob([s2ab(wbout)], {
      type: 'application/octet-stream'
    }),
    `${filename}.${bookType}`
  )
}

setMethods.js

import { parseTime } from '@/utils/index'
import { export_json_to_excel } from '@/vendor/Export2Excel'
/**
 * Parse the json to excel
 *  tableJson 导出数据 ; filenames导出表的名字; autowidth表格宽度自动 true or false; bookTypes xlsx & csv & txt
 * @param {(Object)} tableJson
 * @param {string} filenames
 * @param {boolean} autowidth
 * @param {string} bookTypes
 */
export function json2excel(tableJson, filenames, autowidth, bookTypes) {
  require.ensure([], () => {
    var tHeader = []
    var dataArr = []
    var sheetnames = []
    // 合并列对象
    var multiHeader = []
    var merges = []
    for (var i in tableJson) {
      tHeader.push(tableJson[i].tHeader)
      dataArr.push(formatJson(tableJson[i].filterVal, tableJson[i].tableDatas))
      sheetnames.push(tableJson[i].sheetName)
      var multiHeaderData = [filenames]
      if (tableJson[i].multiHeaderData && tableJson[i].multiHeaderData.length > 0) {
        multiHeaderData = tableJson[i].multiHeaderData
      }
      // 表格标题空白处使用标题填充
      for (var j = 1; j < tableJson[i].tHeader.length; j++) {
        multiHeaderData.push('')
      }
      multiHeader.push(multiHeaderData)
      var mergesData = ['A1:H1']
      merges.push(mergesData)
    }
    export_json_to_excel({
      header: tHeader,
      data: dataArr,
      sheetname: sheetnames,
      filename: filenames,
      autoWidth: autowidth,
      bookType: bookTypes,
      merges: merges,
      multiHeader: multiHeader
    })
  })
}
// 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 {
        // 如果 undefine,返回空字符串
        if (!v[j]) {
          return ''
        }
        return v[j]
      }
    })
  )
}
// 剪切标题
export function cutValue(target, name) {
  var arr = []
  for (var i = 0; i < target.length; i++) {
    arr.push(target[i][name])
  }
  return arr
}

调用代码例1:

// 在vue页面引入插件
import { json2excel } from '@/vendor/setMethods'
// 例
// tHeader= [[表头名称1,表头名称1,表头名称1],[表头名称2]]
// filterVal=  [[columnName1,columnName1,columnName1],[columnName2]]
// tableDatas= [[{columnName1:1,columnName2:2},{},{}],[{}]]
// sheetName= ['sheet1','sheet2','sheet3']
methods: {
    // 导出报表
    handleDownload(sheetLen) {
      var that = this
      var excelDatas = []
      for (let i = 0; i <= sheetLen; i++) {
        var data = {
          tHeader: that.downIndexData.tHeaders[i], // sheet表一头部
          filterVal: that.downIndexData.filterVals[i], // 表一的数据字段
          tableDatas: that.downIndexData.datas[i], // 表一的整体json数据
          sheetName: that.downIndexData.sheetNames[i] // 表一的sheet名字
        }
        excelDatas.push(data)
      }
      const fileName = '月度报表' 
      json2excel(excelDatas, fileName, true, 'xlsx')
    }
}

调用代码例2(导出单个sheet):

　　　　var fileName = data.year + '年' + data.timeRange + '月' + data.reportName + data.orgName
      const tHeader = [ '排序', '指标名称', '单位', '填报值', '上期数据', '指标说明', '备注' ]
      const filterVal = [ 'indexSort', 'indexName', 'unit', 'value', 'termValue', 'describe', 'remark' ]
      var excelDatas = []
      var sheet = {
        tHeader: tHeader, // sheet表一头部
        filterVal: filterVal, // 表一的数据字段
        tableDatas: that.downData, // 表一的整体json数据
        sheetName: fileName // 表一的sheet名字
      }
      excelDatas.push(sheet)
      json2excel(excelDatas, fileName, true, 'xlsx')

 调用代码例3(导出多个sheet):

downReportMony: async function() {
      var that = this
      if (that.crud) {
        that.crud.loading = true
      }
      that.downLoading = true
      var excelDatas = []
      var fileName = that.multipleSelection[0].orgName + '报表'
      for (const data of that.multipleSelection) {
        await that.getTableData(data)
        await that.setDataIndex()
　　　　　// 合并表头名称
        var sheetTitleName = data.year + '年' + data.timeRange + '月' + data.orgName + data.reportName
        const tHeader = ['排序', '指标名称', '单位', '填报值', '上期数据', '指标说明', '备注']
        const filterVal = ['indexSort', 'indexName', 'unit', 'value', 'termValue', 'describe', 'remark']
        var sheet = {
          tHeader: tHeader, // sheet表一头部
          filterVal: filterVal, // 表一的数据字段
          tableDatas: that.downData, // 表一的整体json数据
          multiHeaderData: [sheetTitleName],
          sheetName: data.timeRange + '月' // 表一的sheet名字
        }
        excelDatas.push(sheet)
      }
      json2excel(excelDatas, fileName, true, 'xlsx')
      if (that.crud) {
        that.crud.loading = false
      }
      that.downLoading = false
      that.onlineReportVisible = false
    }

最终合并列导出效果

vue2.5版本的例子,其他版本的vue,引入方式可能会不一样