前后端分离的项目中，导出功能通常是前端调用接口，由后端返回文件的二进制流，再由前端使用Blob的方式将文件字符流数据写入文件，下载下来。有时候场景比较特殊，后端无法提供导出接口，那么就需要前端自己去实现表格下载功能。
1、实现方法依赖两个插件
"dependencies": {
"exceljs": "^4.3.0",
"file-saver": "^2.0.5",
},
2、新建exportExcel.ts文件，封装文件导出相关方法。
import Excel from 'exceljs';
import * as FileSaver from 'file-saver';
export const exportExcel = function(luckysheet:any, value:any) {
// 参数为luckysheet.getluckysheetfile()获取的对象
// 1.创建工作簿，可以为工作簿添加属性
const workbook = new Excel.Workbook();
// 2.创建表格，第二个参数可以配置创建什么样的工作表
if (Object.prototype.toString.call(luckysheet) === '[object Object]') {
luckysheet = [luckysheet];
}
luckysheet.forEach(function(table:any) {
if (table.data.length === 0) return true;
// ws.getCell('B2').fill = fills.
const worksheet = workbook.addWorksheet(table.name);
const merge = (table.config && table.config.merge) || {};
const borderInfo = (table.config && table.config.borderInfo) || {};
// 3.设置单元格合并,设置单元格边框,设置单元格样式,设置值
setStyleAndValue(table.data, worksheet);
setMerge(merge, worksheet);
setBorder(borderInfo, worksheet);
return true;
});
// return
// 4.写入 buffer
return workbook.xlsx.writeBuffer().then(data => {
// console.log('data', data)
const blob = new Blob([data], {
type: 'application/vnd.ms-excel;charset=utf-8'
});
// console.log("导出成功！");
FileSaver.saveAs(blob, `${value}.xlsx`);
});
};
const setMerge = function(luckyMerge = {}, worksheet:any) {
const mergearr = Object.values(luckyMerge);
mergearr.forEach(function(elem:any) {
// elem格式：{r: 0, c: 0, rs: 1, cs: 2}
// 按开始行，开始列，结束行，结束列合并（相当于 K10:M12）
worksheet.mergeCells(
elem.r + 1,
elem.c + 1,
elem.r + elem.rs,
elem.c + elem.cs
);
});
};
const setBorder = function(luckyBorderInfo:any, worksheet:any) {
if (!Array.isArray(luckyBorderInfo)) return;
// console.log('luckyBorderInfo', luckyBorderInfo)
luckyBorderInfo.forEach(function(elem) {
// 现在只兼容到borderType 为range的情况
// console.log('ele', elem)
if (elem.rangeType === 'range') {
const border = borderConvert(elem.borderType, elem.style, elem.color);
const rang = elem.range[0];
const row = rang.row;
const column = rang.column;
for (let i = row[0] + 1; i < row[1] + 2; i++) {
for (let y = column[0] + 1; y < column[1] + 2; y++) {
worksheet.getCell(i, y).border = border;
}
}
}
if (elem.rangeType === 'cell') {
const { col_index, row_index } = elem.value;
const borderData = Object.assign({}, elem.value);
delete borderData.col_index;
delete borderData.row_index;
worksheet.getCell(row_index + 1, col_index + 1).border = addborderToCell(borderData, row_index, col_index);
}
});
};
const setStyleAndValue = function(cellArr:any, worksheet:any) {
if (!Array.isArray(cellArr)) return;
cellArr.forEach(function(row, rowid) {
row.every(function(cell:any, columnid:any) {
if (!cell) return true;
const fill = fillConvert(cell.bg);
const font = fontConvert(
cell.ff,
cell.fc,
cell.bl,
cell.it,
cell.fs,
cell.cl,
cell.ul
);
const alignment = alignmentConvert(cell.vt, cell.ht, cell.tb, cell.tr);
let value = {};
if (cell.f) {
value = { formula: cell.f, result: cell.v };
} else if (!cell.v && cell.ct && cell.ct.s) {
// xls转为xlsx之后，内部存在不同的格式，都会进到富文本里，即值不存在与cell.v，而是存在于cell.ct.s之后
// value = cell.ct.s[0].v
cell.ct.s.forEach((arr:any) => {
value += arr.v;
});
} else {
value = cell.v;
}
// style 填入到_value中可以实现填充色
const letter = createCellPos(columnid);
const target = worksheet.getCell(letter + (rowid + 1));
// console.log('1233', letter + (rowid + 1))
for (const key in fill) {
target.fill = fill;
break;
}
target.font = font;
target.alignment = alignment;
target.value = value;
return true;
});
});
};
const fillConvert = function(bg:any) {
if (!bg) {
return {};
}
// const bgc = bg.replace('#', '')
const fill = {
type: 'pattern',
pattern: 'solid',
fgColor: { argb: bg.replace('#', '') }
};
return fill;
};
const fontConvert = function(
ff = 0,
fc = '#000000',
bl = 0,
it = 0,
fs = 10,
cl = 0,
ul = 0
) {
// luckysheet：ff(样式), fc(颜色), bl(粗体), it(斜体), fs(大小), cl(删除线), ul(下划线)
const luckyToExcel:any = {
0: '微软雅黑',
1: '宋体（Song）',
2: '黑体（ST Heiti）',
3: '楷体（ST Kaiti）',
4: '仿宋（ST FangSong）',
5: '新宋体（ST Song）',
6: '华文新魏',
7: '华文行楷',
8: '华文隶书',
9: 'Arial',
10: 'Times New Roman ',
11: 'Tahoma ',
12: 'Verdana',
num2bl: function(num:number) {
return num === 0 ? false : true;
}
};
// 出现Bug，导入的时候ff为luckyToExcel的val
const font = {
name: typeof ff === 'number' ? luckyToExcel[ff] : ff,
family: 1,
size: fs,
color: { argb: fc.replace('#', '') },
bold: luckyToExcel.num2bl(bl),
italic: luckyToExcel.num2bl(it),
underline: luckyToExcel.num2bl(ul),
strike: luckyToExcel.num2bl(cl)
};
return font;
};
const alignmentConvert = function(
vt = 'default',
ht = 'default',
tb = 'default',
tr = 'default'
) {
// luckysheet:vt(垂直), ht(水平), tb(换行), tr(旋转)
const luckyToExcel:any = {
vertical: {
0: 'middle',
1: 'top',
2: 'bottom',
default: 'top'
},
horizontal: {
0: 'center',
1: 'left',
2: 'right',
default: 'left'
},
wrapText: {
0: false,
1: false,
2: true,
default: false
},
textRotation: {
0: 0,
1: 45,
2: -45,
3: 'vertical',
4: 90,
5: -90,
default: 0
}
};
const alignment = {
vertical: luckyToExcel.vertical[vt],
horizontal: luckyToExcel.horizontal[ht],
wrapText: luckyToExcel.wrapText[tb],
textRotation: luckyToExcel.textRotation[tr]
};
return alignment;
};
const borderConvert = function(borderType:any, style = 1, color = '#000') {
// 对应luckysheet的config中borderinfo的的参数
if (!borderType) {
return {};
}
const luckyToExcel:any = {
type: {
'border-all': 'all',
'border-top': 'top',
'border-right': 'right',
'border-bottom': 'bottom',
'border-left': 'left'
},
style: {
0: 'none',
1: 'thin',
2: 'hair',
3: 'dotted',
4: 'dashDot', // 'Dashed',
5: 'dashDot',
6: 'dashDotDot',
7: 'double',
8: 'medium',
9: 'mediumDashed',
10: 'mediumDashDot',
11: 'mediumDashDotDot',
12: 'slantDashDot',
13: 'thick'
}
};
const template = {
style: luckyToExcel.style[style],
color: { argb: color.replace('#', '') }
};
const border:any = {};
if (luckyToExcel.type[borderType] === 'all') {
border['top'] = template;
border['right'] = template;
border['bottom'] = template;
border['left'] = template;
} else {
border[luckyToExcel.type[borderType]] = template;
}
// console.log('border', border)
return border;
};
function addborderToCell(borders:any, row_index:any, col_index:any) {
const border:any = {};
const luckyExcel:any = {
type: {
l: 'left',
r: 'right',
b: 'bottom',
t: 'top'
},
style: {
0: 'none',
1: 'thin',
2: 'hair',
3: 'dotted',
4: 'dashDot', // 'Dashed',
5: 'dashDot',
6: 'dashDotDot',
7: 'double',
8: 'medium',
9: 'mediumDashed',
10: 'mediumDashDot',
11: 'mediumDashDotDot',
12: 'slantDashDot',
13: 'thick'
}
};
// console.log('borders', borders)
for (const bor in borders) {
// console.log(bor)
if (borders[bor].color.indexOf('rgb') === -1) {
border[luckyExcel.type[bor]] = {
style: luckyExcel.style[borders[bor].style],
color: { argb: borders[bor].color.replace('#', '') }
};
} else {
border[luckyExcel.type[bor]] = {
style: luckyExcel.style[borders[bor].style],
color: { argb: borders[bor].color }
};
}
}
return border;
}
function createCellPos(n:any) {
const ordA = 'A'.charCodeAt(0);
const ordZ = 'Z'.charCodeAt(0);
const len = ordZ - ordA + 1;
let s = '';
while (n >= 0) {
s = String.fromCharCode((n % len) + ordA) + s;
n = Math.floor(n / len) - 1;
}
return s;
}
3、调用，在需要用到的地方引入改方法
import { exportExcel } from '@/utils/exportExcel';
// 导出方法
async function onExport() {
if (multipleSelection.value.length === 0) {
queryData.selectIds = '';
} else {
let selectIds:any = [];
multipleSelection.value.forEach(el => {
selectIds.push(el.uid);
});
queryData.selectIds = selectIds.toString();
}
const { data } = await api.hiddenDanger.getPageList(queryData);
// 表头，加粗
const header = [
[
{ v: '所属区域', bl: 1 },
{ v: '隐患类型', bl: 1 },
{ v: '隐患子类型', bl: 1 },
{ v: '隐患级别', bl: 1 },
{ v: '隐患地址', bl: 1 },
{ v: '隐患描述', bl: 1 },
{ v: '处置状态', bl: 1 },
{ v: '隐患来源', bl: 1 },
{ v: '权属单位', bl: 1 },
{ v: '隐患检查日期', bl: 1 },
{ v: '隐患时长', bl: 1 },
]
];
// 数据内容
let content:any = [];
data.forEach((el:any) => {
const row = [
{ v: el._districtId },
{ v: el._subjectType },
{ v: el._dangerType },
{ v: el._level },
{ v: el.address },
{ v: el.remark },
{ v: el._state },
{ v: el._dangerSource },
{ v: el._orgId },
{ v: el.checkDate },
{ v: el.dangerDuration }
];
content.push(row);
});
const sheet = [
{
name: 'Sheet1',
data: [...header, ...content],
}
];
exportExcel(sheet, '隐患管理');
}
