excel的前端導入導出

純前端導出excel（含樣式）

1.安裝插件

npm install xlsx-style –save

2.如果報錯，請修改如下文件，若沒問題忽略這一步

(1)第一種方法：找到項目文件下的node_modules\xlsx-style\dist\cpexcel.js的文件，大概在807行，修改如下：

（2）第二種方法，不使用第一種的插件，使用個人修改後的非官方插件：npm install --save yxg-xlsx-style（插件的內容也就是第一種修改方法改變後的插件形式，這個插件是別人上傳修改後這個問題的，具體上傳人我忘記了）

3.編寫導出excel導出工具js文件（位置可放在src下的任何地方<按自己想法>）

文件內容如下(可根據自己需要修改)：
/* eslint-disable */
require('script-loader!file-saver');
import XLSX from 'xlsx-style' // 根據自己安裝插件導入(import XLSX from 'yxg-xlsx-style'）

function generateArray(table) {
  let out = [];
  let rows = table.querySelectorAll('tr');
  let ranges = [];
  for (let R = 0; R < rows.length; ++R) {
    let outRow = [];
    let row = rows[R];
    let columns = row.querySelectorAll('td');
    for (let C = 0; C < columns.length; ++C) {
      let cell = columns[C];
      let colspan = cell.getAttribute('colspan');
      let rowspan = cell.getAttribute('rowspan');
      let 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 (let 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 (let k = 0; k < colspan - 1; ++k) outRow.push(null);
    }
    out.push(outRow);
  }
  return [out, ranges];
};

function datenum(v, date1904) {
  if (date1904) v += 1462;
  let epoch = Date.parse(v);
  return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
}

/**
 *
 * @param data 導出數據
 * @param headerRow 表頭佔的行數
 */
function sheet_from_array_of_arrays(data, headerRow) {
  var ws = {};
  var range = {
    s: {
      c: 10000000,
      r: 10000000
    },
    e: {
      c: 0,
      r: 0
    }
  };
  for (let R = 0; R != data.length; ++R) {
    for (let 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;
      // 設置單元格數據以及樣式
      let cell = {
        v: data[R][C],
        s: {
          font: { name: '微軟雅黑' },
          alignment: { horizontal: "center", vertical: "center" }
        }
      };
      // 設置表頭樣式
      if (headerRow && R < headerRow) {
        cell.s = {
          alignment: { horizontal: "center", vertical: "center" },
          fill: { bgColor: { indexed: 64 }, fgColor: { rgb: "909399" } },
          font: { name: '微軟雅黑', bold: false, italic: false, underline: false },
          border: {
            top: {
              style: 'thin',
              color: {rgb: 'A5A5A5'}
            },
            bottom: {
              style: 'thin',
              color: {rgb: 'A5A5A5'}
            },
            left: {
              style: 'thin',
              color: {rgb: 'A5A5A5'}
            },
            right: {
              style: 'thin',
              color: {rgb: 'A5A5A5'}
            }}
        }
      }
      if (cell.v == null) cell.v = '';
      let 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) {
  let buf = new ArrayBuffer(s.length);
  let view = new Uint8Array(buf);
  for (let i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
  return buf;
}
// 根據自己網頁編寫的table可直接導出，注意樣式不能複雜，不然會報錯
export function export_table_to_excel(id) {
  let theTable = document.getElementById(id);
  let oo = generateArray(theTable);
  let ranges = oo[1];

  /* original data */
  let data = oo[0];
  let ws_name = "SheetJS";

  let 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;

  let wbout = XLSX.write(wb, {
    bookType: 'xlsx',
    bookSST: false,
    type: 'binary'
  });

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

/**
 *
 * @param multiHeader 多表頭
 * @param ws_names 頁籤（sheet）,默認:SheetJS
 * @param header 單表頭
 * @param data 導出數據
 * @param filename 導出文件名稱,默認: excel-list
 * @param merges 合併單元格（例如: ['A1:B1']）
 * @param autoWidth 單元格寬度, 默認:自動適應數據寬度
 * @param bookType 導出類型 默認: 'xlsx'
 */
export function export_json_to_excel({
  multiHeader = [],
  ws_names = [],
  header,
  data,
  filename,
  merges = [],
  autoWidth = true,
  bookType=  'xlsx'
} = {}) {
  /* original data */
  filename = filename || 'excel-list'
  data = [...data]
  let headerRow = 0 // 表頭佔的行數
  if (header) {
    data.unshift(header);
    headerRow++
  }
  for (let i = multiHeader.length-1; i > -1; i--) {
    data.unshift(multiHeader[i])
    headerRow++
  }
  let ws_name = 'SheetJS'
  if (ws_names && ws_names.length > 0) {
    ws_name = ws_names[0]
  }
  let wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data, headerRow); // 獲取頁籤

  if (merges.length > 0) {
    if (!ws['!merges']) ws['!merges'] = [];
    merges.forEach(item => {
      ws['!merges'].push(XLSX.utils.decode_range(item))
    })
  }

  if (autoWidth) {
    /*設置worksheet每列的最大寬度*/
    const colWidth = data.map(row => row.map(val => {
      /*先判斷是否爲null/undefined*/
      if (val == null) {
        return {
          'wch': 10
        };
      }
      /*再判斷是否爲中文*/
      else if (val.toString().charCodeAt(0) > 255) {
        return {
          'wch': val.toString().length * 2
        };
      } else {
        return {
          'wch': val.toString().length
        };
      }
    }))
    /*以第一行爲初始值*/
    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;

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

提供本人編寫文件<無法上傳有需要可以聯繫> ，以及存放位置參考

裏面提供了兩種導出方式：
1.	根據自己寫的表格樣式通過傳dom的id進行導出：export function export_table_to_excel(id)
2.	根據傳遞參數進行導出：export function export_table_to_excel(id)
 // 推薦使用第二種，可自己添加導出樣式

4.列舉例子的使用，以第二種導出方法爲例

5.導出後的結果截圖

6.參考導出API

(3) 參考API地址
導出樣式地址鏈接

純前端讀取excel數據並調接口保存數據

1.使用插件xlsx

運行命令: npm install xlsx –save

2.讀取excel文件的工具js文件，導入比較簡單就不做詳細的描述

export function readerExcel(f, headerCodes) {
  return new Promise(resolve => {
    const res = [] // 組裝表格數據對象
    let binary = ''
    let wb // 讀取完成的數據
    let outData
    const reader = new FileReader()
    reader.onload = function(e) {
      const bytes = new Uint8Array(reader.result)
      const length = bytes.byteLength
      for (let i = 0; i < length; i++) {
        binary += String.fromCharCode(bytes[i])
      }
      const XLSX = require('xlsx')
      wb = XLSX.read(binary, {
        type: 'binary'
      })
      const sheetArr = wb.Sheets // excel的sheet
      wb.SheetNames.map((sheetName, sheetIndex) => {
        outData = XLSX.utils.sheet_to_json(sheetArr[sheetName]) // outData就是你想要的東西
        this.da = [...outData]
        const arr = []
        this.da.map(v => {
          const obj = {}
          let i = 0
          for (const key in v) {
            obj[headerCodes[sheetIndex][i] || 'def' + i] = v[key]
            i++
          }
          arr.push(obj)
        })
        res.push(arr)
      })
      resolve(res)
    }
    reader.readAsArrayBuffer(f)
  })
}

3.讀取excel數據以後自己按照需要調接口傳值到後端進行數據保存