vue中電子表格的導入導出

一、安裝

npm install -S file-saver xlsx
npm install -D script-loader

二、在src下新建vender文件夾，裝Blob.js和 Export2Excel.js這兩個文件

然後在index.js中導入

import Blob from './../../vender/Blob.js'
import Export2Excel from './../../vender/Export2Excel.js'

Blob.js

/* eslint-disable */
/* Blob.js
 * A Blob implementation.
 * 2014-05-27
 *
 * By Eli Grey, http://eligrey.com
 * By Devin Samarin, https://github.com/eboyjr
 * License: X11/MIT
 *   See LICENSE.md
 */

/*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(/^\[object\s(.*)\]$/)[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
                ;
            FakeBlob.fake = FB_proto.fake = true;
            while (file_ex_code--) {
                FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1;
            }
            if (!real_URL.createObjectURL) {
                URL = view.URL = {};
            }
            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 = this.data.length = 0;
            };
            return FakeBlobBuilder;
        }(view));

    view.Blob = function Blob(blobParts, options) {
        var type = options ? (options.type || "") : "";
        var builder = new BlobBuilder();
        if (blobParts) {
            for (var i = 0, len = blobParts.length; i < len; i++) {
                builder.append(blobParts[i]);
            }
        }
        return builder.getBlob(type);
    };
}(typeof self !== "undefined" && self || typeof window !== "undefined" && window || this.content || this));

Export2Excel.js

/* eslint-disable */
require('script-loader!file-saver');
require('script-loader!@/vender/Blob');
require('script-loader!xlsx/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);
    console.log('a')
    var oo = generateArray(theTable);
    var ranges = oo[1];

    /* original data */
    var data = oo[0];
    var ws_name = "SheetJS";
    console.log(data);

    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")
}

function formatJson(jsonData) {
    console.log(jsonData)
}
export function export_json_to_excel(th, jsonData, defaultTitle) {

    /* original data */

    var data = jsonData;
    data.unshift(th);
    var ws_name = "SheetJS";
    var wb = new Workbook(), ws = sheet_from_array_of_arrays(data);
    /* 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'});
    var title = defaultTitle || '列表'
    saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), title + ".xlsx")
}

導入

導入的按鈕

<button>
   <span> 導入學生信息</span>
   <input id="upfile" style="opacity:0;width:100%;height:100%;position:absolute;top:0;left:0; cursor: pointer;" type="file" name="upfile"  @change="importExcel($event.target)"/>
</button>

//導入
    importExcel(obj){
          if (!obj.files) {    //導入的數據
                return;
            }
            let file = obj.files[0],   //導入的數據
            types = file.name.split('.')[1],   //拿到類型
            fileType = ["xlsx", "xlc", "xlm", "xls", "xlt", "xlw", "csv"].some(item => item === types);
            if (!fileType) {
                alert("格式錯誤！請重新選擇");
                return;
            }
            this.file2Xce(file).then(tabJson => {         //tabJson就是解析出來的json數據,數據格式如下
                if (tabJson && tabJson.length > 0) {
                    this.file3cex(tabJson)
                }
            });
        },
      file2Xce(file) {
          return new Promise(function (resolve, reject) {
              let reader = new FileReader();     //創建FileReader對象，將文件內容讀入內存，通過一些api接口，可以在主線程中訪問本地文件
              reader.onload = function (e) {    //onload	當讀取操作成功完成時調用
                  let data = e.target.result;
                  this.wb = XLSX.read(data, {
                      type: 'binary'                     //二進制
                  });
                  // XLSX.utils.json_to_sheet(data) 接收一個對象數組並返回一個基於對象關鍵字自動生成的“標題”的工作表，默認的列順序由使用Object.keys的字段的第一次出現確定
                  resolve(XLSX.utils.sheet_to_json(this.wb.Sheets[this.wb.SheetNames[0]]));
              };
              reader.readAsBinaryString(file);    //	異步按字節讀取文件內容，結果爲文件的二進制串
          });
      },
      file3cex(obj){
        if(this.classid==''){
             this.$message({
            type:'info',
            message:'請選擇班級後導入學生信息'
          })
        }else{
          var data=obj.map(el=>{
          let obj={}
            obj.numberID=el.學號
            obj.name=el.學生姓名
            obj.sex=el.學生性別
            if (el.學生性別=='男') {
              obj.sex=1
            }else if (el.學生性別=='女') {
              obj.sex=2
            }
            obj.grade_id=this.classid
            obj.account=el.學生賬號
            obj.password=el.學生密碼
            return obj
          })
          var czxh = data[0].numberID
          var xcount = 0
          for (let i of data) {
            if (i.numberID === czxh) {
              xcount = xcount + 1
            }
          }
          var czzh = data[0].account
          var count = 0
          for (let i of data) {
            if (i.account === czzh) {
              count = count + 1
            }
          }
          if(xcount>0){
            if(count>0){
              this.axios.insertStudents(data).then(res=>{
                if(res.data>0){
                  this.$message({
                    type:'success',
                    message:'成功導入'+res.data+'位學生信息'
                  })
                }else{
                  this.$message({
                    type:'info',
                    message:'導入失敗'
                  })
                }
              }).then(err=>{

              })
            }else{
              alert('學生賬號重複，請檢查後重新導入')
            }
          }else{
            alert('學生學號重複，請檢查後重新導入')
          }  
        }
      },

導出

點擊帶出按鈕的時候，直接請求數據，給到導出方法，但經常有些東西顯示的和數據有所不同（比如：男女一般用 1和2來表示），這時就需要處理一下數據，在給到導出方法。

//導出
    exportStu(){
      if (this.classid) {
        this.axios.findStudent({
          grade_id:this.classid
        }).then(res=>{
          var data=res.data.map(item=>{
            item.exsex=item.sex==1?'男':item.sex==2?'女':'';
            return item;
          });
          this.ExportStuInformation(data);
        }).catch(err=>{

        })
      }else{
        alert('請選擇班級後導出學生信息!')
      }
    },
    ExportStuInformation(exdata){
      require.ensure([],()=>{
          const {export_json_to_excel} = require('../../../vender/Export2Excel');
          const tHeader=['學號','學生姓名','學生性別','所屬班級','學生賬號','學生密碼','權限','旅行社名稱']  //表頭
          const filterVal=['numberID','name','exsex','grade_id','account','password','permiss','travelAgencyName']//數據對應列名
          const list=exdata// 表格數據
          const data=this.formatJson(filterVal,list)
          export_json_to_excel(tHeader,data,'學生信息')
      })
    },
    //格式化json文件
    formatJson(filterVal, jsonData) {           //filterVal是data中list的key值
        return jsonData.map(v => filterVal.map(j => v[j]));    //list可能爲空,所以報錯map未定義
    },