VUE项目实现表格导出EXCEL表格（自定义样式及多级表头）

第一：安装依赖

npm install -S file-saver xlsx
npm install -D script-loader
npm install -D xlsx-style （自定义样式）

第二：在目录里新建excel文件夹
在excel文件夹里新建两个js文件（Blob.js和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('./Blob');
require('script-loader!xlsx/dist/xlsx.core.min');
import XLSX from 'xlsx-style';
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);
}

const defaultCellStyle = {
	font: {
		name: "微软雅黑", sz: 12, color: { auto: 1 } ,
	},
	border: {
		color: { auto: 1 },
	   top: { style: 'thin' },
	   bottom: { style: 'thin'},
	   left: { style: 'thin' },
	   right: { style: 'thin' }
	},
	alignment: {
		/// 自动换行
		wrapText: 1,
			// 居中
		horizontal: "center",
		vertical: "center",
		indent: 0
	}
};

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] };
			/// 这里生成cell的时候，使用上面定义的默认样式
			const cell = {v: data[R][C], s: defaultCellStyle};
			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);

	/*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 };
			} else if (val.toString().charCodeAt(0) > 255) {
				/*再判断是否为中文*/
				return { wch: val.toString().length * 2 };
			} else {
				return { wch: val.toString().length };
			}
		})
	);
	/*以第一行为初始值*/
	let result = colWidth[0];
	colWidth[0][0]['wch'] = 10;
	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;

	// const borderAll = {
	// 	//单元格外侧框线
	// 	top: { style: 'thin' },
	// 	bottom: { style: 'thin' },
	// 	left: { style: 'thin' },
	// 	right: { style: 'thin' }
	// };
	// data['!cols'] = [];
	// for (let key in data) {
	// 	if (data[key] instanceof Object) {
	// 		data[key].s = {
	// 			border: borderAll,
	// 			alignment: {
	// 				horizontal: 'center', //水平居中对齐
	// 				vertical: 'center'
	// 			},
	// 			font: { sz: 12 },
	// 			bold: true,
	// 			numFmt: 0
	// 		};
	// 		data['!cols'].push({ wpx: 115 });
	// 	}
	// 	// console.log(1)
	// }

	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（我是建在utils文件夹）

export function export2Excel(columns,list,calName){
    require.ensure([], () => {
        const { export_json_to_excel } = require('../excel/Export2Excel');  // 注意路径
        let tHeader = []
        let filterVal = []
        // console.log(columns)
        if(!columns){
            return;
        }
        columns.forEach(item =>{
            tHeader.push(item.title)
            filterVal.push(item.key)
        })
        const data = list.map(v => filterVal.map(j => v[j]))
        export_json_to_excel(tHeader, data, calName);
    })
}

第四：在需要的页面import引入

import { export2Excel } from '../utils/util'

第五：点击导出

多级表头导出

新建Export2Excel2.js内容同Export2Excel.js一样 ，
同样的export_json_to_excel方法，Export2Excel.js的export_json_to_excel是正常导出excel，Export2Excel2.js里面的export_json_to_excel是导出多级表头

export function export_json_to_excel ({
  title,//标题
  multiHeader = [],
  header,//表头 格式:[[],[]]多级菜单，从下往上
  data,//格式后的数据
  filename,//表名
  merges = [],//需要合并的单元格 格式:[[],[]]
  autoWidth = true,
  bookType = 'xlsx'
} = {}) {
  /* original data */
  //判断是否有表名、没有则赋予固定表名
  filename = filename || 'excel-list'
  //获取所有数据
  data = [...data]
  //添加表头进数据最上层
  header.forEach(element => {
    data.unshift(element);
  });
  //添加标题进数据最上层  在表头之上
  data.unshift(title);
  //判断multiHeader是否有值(原作为标题后修改的值)
  for (let i = multiHeader.length - 1; i > -1; i--) {
    data.unshift(multiHeader[i])
  }

  var ws_name = "SheetJS";
  var wb = new Workbook(),
    //将data转化格式 用于接下来动态宽度
    ws = sheet_from_array_of_arrays(data);

  //合并单元格
  if (merges.length > 0) {
    if (!ws['!merges']) ws['!merges'] = [];
    merges.forEach(a => {
      a.forEach(item => {
        ws['!merges'].push(XLSX.utils.decode_range(item))
      })
    })
  }
  //动态设置宽度
  if (autoWidth) {
   console.log(1)
  }
   /*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': 13
      };
    }
    /*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
      };
    }
  }))
  //判断合并单元格中是否有同行合并，有则将其长度设为0
  if (merges.length > 0) {
    if (!ws['!merges']) ws['!merges'] = [];
    merges.forEach(a => {
      a.forEach(item => {
        let q = item.split(':')
        let w1 = q[0].substring(0, 1)
        let e1 = q[0].substring(1, 2)
        let w2 = q[1].substring(0, 1)
        let e2 = q[1].substring(1, 2)
        if (e1 == e2) {
          let abc = {
            "A": 0, "B": 1, "C": 2, "D": 3, "E": 4, "F": 5, "G": 6, "H": 7, "I": 8, "J": 9,
            "K": 10, "L": 11, "M": 12, "N": 13, "O": 14, "P": 15, "Q": 16, "R": 17, "S": 18, "T": 19, "U": 20,
            "V": 21, "W": 22, "X": 23, "Y": 24, "Z": 25
          };
          if (abc[w1] > abc[w2]) {
            let jh = w1
            w1 = w2
            w2 = jh
          }
          for (let i = abc[w1]; i <= abc[w2]; i++) {
            colWidth[e1 - 1][i]['wch'] = 0;
          }
        }
      })
    })
  }
  /*以第一行为初始值 判断对应每一列的最大长度*/
  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 dataInfo = wb.Sheets[wb.SheetNames[0]];

  const borderAll = {  //单元格外侧框线
    top: {
      style: 'thin'
    },
    bottom: {
      style: 'thin'
    },
    left: {
      style: 'thin'
    },
    right: {
      style: 'thin'
    }
  };
  //给所以单元格加上边框
  for (var i in dataInfo) {
    if (i == '!ref' || i == '!merges' || i == '!cols' || i == 'A1') {

    } else {
      dataInfo[i + ''].s = {
        border: borderAll,
        //居中属性
        alignment: {
          horizontal: "center",
          vertical: "center"
        },
      }
    }
  }

  //设置主标题样式
  dataInfo["A1"].s = {
    font: {
      name: '宋体',
      sz: 12,
      color: { rgb: "000000" },
      bold: true,
      italic: false,
      underline: false
    },
    alignment: {
      horizontal: "center",
      vertical: "center"
    },
    // fill: {
    //   fgColor: {rgb: "008000"},
    // },
  };




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

使用

 // 拼接数据
    formatJson(filterVal, jsonData) {
      return jsonData.map((v) => filterVal.map((j) => v[j]))
    },
    handleDownloadExcel(item,ssssss) {
      console.log(item)
      console.log(ssssss)
      require.ensure([], () => {
        const { export_json_to_excel } = require('../excel/Export2Excel2') //注意这个Export2Excel路径
        const tHeader = [
          ['', '试航基准', '静水(当前拟合)', '静水(历史实际)', 'bf5(当前拟合)', 'bf5(历史实际)', '试航基准', '静水(当前拟合)', '静水(历史实际)', 'bf5(当前拟合)', 'bf5(历史实际)'], // 第二行数据
          [
            '',
            '满载',
            '',
            '',
            '',
            '',
            '空载',
            '',
            '',
            '',
            '',
          ],//第一行
          
        ]
        // 上面设置Excel的表格第一行的标题 格式为[[],[]]单行就输入[[]]
        const title = ['航速(kn)','油耗(t/day)', '', '', '', '', '', '', '', '', '', ] //标题 长度要标题长度一致
        const filterVal = [
          'speed',
          'scantlingBasic',
          'scantlingFitNows',
          'scantlingPractHiss',
          'scantlingBfxFitNows',
          'scantlingBfxPractHiss',
          'ballastBasic',
          'ballastFitNows',
          'ballastPractHiss',
          'ballastBfxFitNows',
          'ballastBfxPractHiss',
        ] // tableData里对象的属性key值 就是对应的属性名
        const list = ssssss //把要导出的数据tableData存到list
        const data = this.formatJson(filterVal, list)
        data.map((item) => {
          // console.log(item)
          item.map((i, index) => {
            if (!i) {
              item[index] = ''
            }
          })
        })
        const merges = [['A1:A3'], ['B1:K1'], ['B2:F2'], ['G2:K2']] //合并单元格 格式[[],[]]
        export_json_to_excel({
          title: title,
          header: tHeader,
          data,
          merges,
          filename: item + '油耗分析',
          autoWidth: true,
          bookType: 'xlsx',
        })
      })
      // import('@/util/Export2Excel').then(excel=>{
      //   console.log(excel)
      // })
    },