VUE导入Excel

import FilenameOption from './components/FilenameOption'
import AutoWidthOption from './components/AutoWidthOption'
import BookTypeOption from './components/BookTypeOption'
 
handleDownload() {
      this.downloadLoading = true
      import('@/vendor/Export2Excel').then(excel => {
        const tHeader = ['Id', 'Title', 'Author', 'Readings', 'Date']
        const filterVal = ['id', 'title', 'author', 'pageviews', 'display_time']
        const list = this.list
        const data = this.formatJson(filterVal, list)
        excel.export_json_to_excel({
          header: tHeader,
          data,
          filename: this.filename,
          autoWidth: this.autoWidth,
          bookType: this.bookType
        })
        this.downloadLoading = false
      })
    },
    formatJson(filterVal, jsonData) {
      return jsonData.map(v => filterVal.map(j => {
        if (j === 'timestamp') {
          return parseTime(v[j])
        } else {
          return v[j]
        }
      }))
    }

Export2Excel

/* eslint-disable */
require('script-loader!file-saver');
import XLSX from 'xlsx'
 
function generateArray(table) {
  var out = [];
  var rows = table.querySelectorAll('tr');
  var ranges = [];
  for (var R = ; R < rows.length; ++R) {
    var outRow = [];
    var row = rows[R];
    var columns = row.querySelectorAll('td');
    for (var C = ; 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 = ; i <= range.e.c - range.s.c; ++i) outRow.push(null);
        }
      });
 
      //Handle Row Span
      if (rowspan || colspan) {
        rowspan = rowspan || ;
        colspan = colspan || ;
        ranges.push({
          s: {
            r: R,
            c: outRow.length
          },
          e: {
            r: R + rowspan - ,
            c: outRow.length + colspan -
          }
        });
      };
 
      //Handle Value
      outRow.push(cellValue !== "" ? cellValue : null);
 
      //Handle Colspan
      if (colspan)
        for (var k = ; k < colspan - ; ++k) outRow.push(null);
    }
    out.push(outRow);
  }
  return [out, ranges];
};
 
function datenum(v, date1904) {
  if (date1904) v += ;
  var epoch = Date.parse(v);
  return (epoch - new Date(Date.UTC(, , ))) / ( *  *  * );
}
 
function sheet_from_array_of_arrays(data, opts) {
  var ws = {};
  var range = {
    s: {
      c: ,
      r:
    },
    e: {
      c: ,
      r:
    }
  };
  for (var R = ; R != data.length; ++R) {
    for (var C = ; 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[];
        cell.v = datenum(cell.v);
      } else cell.t = 's';
 
      ws[cell_ref] = cell;
    }
  }
  if (range.s.c < ) 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 = ; 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[];
 
  /* original data */
  var data = oo[];
  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-; i > -; i--) {
    data.unshift(multiHeader[i])
  }
 
  var ws_name = "SheetJS";
  var wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data);
 
  if (merges.length > ) {
    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':
        };
      }
      /*再判断是否为中文*/
      else if (val.toString().charCodeAt() > ) {
        return {
          'wch': val.toString().length *
        };
      } else {
        return {
          'wch': val.toString().length
        };
      }
    }))
    /*以第一行为初始值*/
    let result = colWidth[];
    for (let i = ; i < colWidth.length; i++) {
      for (let j = ; 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}`);
}

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