vue2.0+Element-ui导出table为Excel

我们项目(物联网)基本上都是后台管理系统那种样子，所以Element简直对胃口，也有很多表单导出，以此记忆。

准备依赖文件的下载

1， cnpm install jszip 导出为压缩文件
2，cnpm install xlsx 处理excel
3，cnpm install [email protected] 暂存文件
4，cnpm install --save-dev script-loader 挂载js,(emmm，有些宝宝说有时候报错找不到，那就试试：npm install -S file-saver，npm install -S xlsx，npm install -D script-loader)

准备js文件

在项目src文件夹下建一个文件夹(exportJs)，新建3个js文件如下，放进这个文件夹:
1,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));
    

2,Export2Excel.js:

/* eslint-disable */
require('script-loader!file-saver');
require('script-loader!@/vendor/Blob');
import XLSX from 'xlsx'
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(), 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(th, jsonData, defaultTitle) {
    /* original data */
    var data = jsonData;
    //console.log('th',th);
    //console.log('jsonData',jsonData);
    //console.log('defaultTitle',defaultTitle)
    data.unshift(th);
    var ws_name = "SheetJS";
    var wb = new Workbook(), ws = sheet_from_array_of_arrays(data);
    /*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': 10};
      }
      /*再判断是否为中文*/
      else if (val.toString().charCodeAt(0) > 255) {
        return {'wch': val.toString().length * 2};
      } else {
        return {'wch': val.toString().length};
      }
    }))
    /*以第一行为初始值*/
    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;
    var wbout = XLSX.write(wb, {bookType: 'xlsx', bookSST: false, type: 'binary'});
    var title = defaultTitle || 'excel-list'
    saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), title + ".xlsx")
}

3,Export2Zip.js:

/* eslint-disable */
require('script-loader!file-saver');
import JSZip from 'jszip'
export function export_txt_to_zip(th, jsonData, txtName, zipName) {
  const zip = new JSZip()
  const txt_name = txtName || 'file'
  const zip_name = zipName || 'file'
  const data = jsonData
  let txtData = `${th}\r\n`
  data.forEach((row) => {
    let tempStr = ''
    tempStr = row.toString()
    txtData += `${tempStr}\r\n`
  })
  zip.file(`${txt_name}.txt`, txtData)
  zip.generateAsync({type:"blob"}).then((blob) => {
    saveAs(blob, `${zip_name}.zip`)
  }, (err) => {
    alert('导出失败')
  })
}

封装公共方法

再次新建一个和上一个文件夹同级的文件夹（exportMethod），就是为了整齐啊，然后新建一个js文件（exportExcel.js）:

let Export = {
    /**
     * 导出事件封装：
     *  @param  header [Array]  传入的表头数组
     *  @param  headValue [Array]  传入的表头字段对应的数组
     *  @param  tableCode [Array]  传入的表格数据源
     *  @param  tableName [String]  传入的表格名字
     */
    ExportExcel (header,headValue,tableCode,tableName) {
        import("@/exportJs/Export2Excel").then(excel => {
          //表格的表头列表
            const tHeader = header;
          //与表头相对应的数据里边的字段
            const filterVal = headValue;
            const list = tableCode;
            const data = filter.formatJson(filterVal, list); 
            //这里还是使用export_json_to_excel方法比较好，方便操作数据
            excel.export_json_to_excel(tHeader,data,tableName);
        })
    } 
}
let filter = {
    // 导出Excel时对数据源进行改变
    formatJson (filterVal, jsonData) {
        return jsonData.map(v =>
        filterVal.map(j => {
            return v[j]
        })
        )
    }
}
export default Export

开始导出

在页面中引入js：import Export from '../exportMethod/exportExcel'
按钮加上导出事件@click="ExportExcels"，在methods:

ExportExcels () {
        Export.ExportExcel(['登录名', '登录密码', '真实姓名', '手机号', '备注'],['loginName', 'pwd', 'realName', 'mobile', 'remark'],this.tableData,'用户信息')
    },

这个this.tableData当然是数据源啦！至此就能成功导出啦！der~~

注意：如果要对导出数据进行转换，如下：
将封装公共方法的exportExcel.js里面的filter ：

formatJson (filterVal, jsonData) {
      return jsonData.map(v =>
        filterVal.map(j => {
		//如果数据不需要处理，则直接写return v[j]，如数据需要处理，写if-else语句就好了
		//if (j == 'nameNumber') {
			//if (v[j] == '36') {
				//return (v[j] = '是小明')
			//} else if (){

			//} else {

			//}
		//}
          return v[j]
        })
      )
    }

快过年了，一心只想回去响炮
做人，最重要的是开心嘛，der