Vue 导出excel 自适应宽度

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

            const blob = 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 BlobBuildervar 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;
                    } elseif (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);
                    }
                } elseif (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 stringif (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);
                } elseif (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 syncthrownew FileException("NOT_READABLE_ERR");
                    }
                } elseif (data instanceof FakeBlob) {
                    if (data.encoding === "base64" && atob) {
                        bb.push(atob(data.data));
                    } elseif (data.encoding === "URI") {
                        bb.push(decodeURIComponent(data.data));
                    } elseif (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;
                }
                returnnew 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;
                }
                returnnew 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);
    };
}
exports.blob = blob;

            /*
             eslint-disable 
            */
            
require(
            ‘
            script-loader!file-saver
            ‘
            );

            //
             require(‘script-loader!./Blob‘);
            const {blob} = require(‘./Blob‘)
require(‘script-loader!xlsx/dist/xlsx.core.min‘);
function generateArray(table) {
    varout = [];
    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 Spanif (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 Colspanif (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‘;
            elseif (typeof cell.v === ‘boolean‘) cell.t = ‘b‘;
            elseif (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)) returnnew 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,   autoWidth = true,
    bookType = ‘xlsx‘,
    myRowFont = ‘1‘) {

    /* original data */var data = jsonData;
    data.unshift(th);
    var ws_name = "SheetJS";

    var wb = new Workbook(), ws = sheet_from_array_of_arrays(data);
    console.log(autoWidth)
    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‘: 10
            };
          }
          /*再判断是否为中文*/elseif (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 || ‘列表‘
    saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), title + ".xlsx")
}

            //
            util.js
import "./Blob";

export { json2excel, getCharCol, formatJson };

// function parseTime(time, cFormat) {
//   if (arguments.length === 0) {
//     return null;
//   }
//   const format = cFormat || "{y}-{m}-{d} {h}:{i}:{s}";
//   let date;
//   if (typeof time === "object") {
//     date = time;
//   } else {
//     if (typeof time === "string" && /^[0-9]+$/.test(time)) {
//       time = parseInt(time);
//     }
//     if (typeof time === "number" && time.toString().length === 10) {
//       time = time * 1000;
//     }
//     date = new Date(time);
//   }
//   const formatObj = {
//     y: date.getFullYear(),
//     m: date.getMonth() + 1,
//     d: date.getDate(),
//     h: date.getHours(),
//     i: date.getMinutes(),
//     s: date.getSeconds(),
//     a: date.getDay()
//   };
//// eslint-disable-next-line
//   const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
//     let value = formatObj[key];
//// Note: getDay() returns 0 on Sunday
//     if (key === "a") {
//       return ["日", "一", "二", "三", "四", "五", "六"][value];
//     }
//     if (result.length > 0 && value < 10) {
//       value = "0" + value;
//     }
//     return value || 0;
//   });
//// eslint-disable-next-line
//   return time_str;
// }
function json2excel(tableJson, filenames, autowidth, bookTypes) {
  import("@/excel/Export2Excel").then(excel => {
    var tHeader = [];
    var dataArr = [];
    var sheetnames = [];
    for (var i in tableJson) {
      tHeader.push(tableJson[i].tHeader);
      dataArr.push(formatJson(tableJson[i].filterVal, tableJson[i].tableDatas));
      sheetnames.push(tableJson[i].sheetName);
    }
    excel.export_json_to_excel({
      header: tHeader,
      data: dataArr,
      sheetname: sheetnames,
      filename: filenames,
      autoWidth: autowidth,
      bookType: bookTypes
    });
  });
}
// 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 {
        return v[j];
      }
    })
  );
}

// 获取26个英文字母用来表示excel的列function getCharCol(n) {
  for (var i = 0; i < this.list.length; i++) {
    this.list[i].showActive = false;
    if (index == i) {
      this.list[index].showActive = true;
    }
  }

  let temCol = "",
    s = "",
    m = 0;
  while (n > 0) {
    m = (n % 26) + 1;
    s = String.fromCharCode(m + 64) + s;
    n = (n - m) / 26;
  }
  return s;
}

npm install --save xlsx-style


在\node_modules\xlsx-style\dist\cpexcel.js 807行 的 var cpt = require(’./cpt’ + ‘able’); 改成 var cpt = cptable;

             export2Excel() {
      require.ensure([], () => {
        const { export_json_to_excel } = require("../../../excel/Export2Excel");
        const tHeader = [
          "订单号",
          "商品名",
          "单价数量",
          "买家名称",
          "备注",
          "实付款",
          "下单时间"
        ];
        const filterVal = [
          "order_no",
          "snap_name",
          "djnum",
          "byname",
          "remark",
          "total_price",
          "update_time"
        ];

        const list = this.exportList;
        const data = this.formatJson(filterVal, list);
        export_json_to_excel(tHeader, data, this.$router.history.current.name);
      });
    },
    formatJson(filterVal, jsonData) {
      return jsonData.map(v => filterVal.map(j => v[j]));
    }