使用exceljs导出luckysheet表格

使用exceljs。文档：https://github.com/exceljs/exceljs/blob/HEAD/README_zh.md

const Excel = require('exceljs')

var exportExcel = exports.exportExcel =  async function (luckysheet) { // 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
	luckysheet.every(function (table) {
		if (table.data.length === 0) return true
		const worksheet = workbook.addWorksheet(table.name)
		// 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(table.config.merge, worksheet)
		setBorder(table.config.borderInfo, worksheet)
		return true
	})
	// 4.写入 buffer
	const buffer = await workbook.xlsx.writeBuffer()
	return buffer
}

var setMerge = function (luckyMerge = {}, worksheet) {
	const mergearr = Object.values(luckyMerge)
	mergearr.forEach(function (elem) { // 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)
	})
}

var setBorder = function (luckyBorderInfo, worksheet) {
	if (!Array.isArray(luckyBorderInfo)) return
	luckyBorderInfo.forEach(function (elem) {
		let border = borderConvert(elem.borderType, elem.style, elem.color)
		let rang = elem.range[0]
		// console.log(rang.column_focus + 1, rang.row_focus + 1)
		worksheet.getCell(rang.row_focus + 1, rang.column_focus + 1).border = border
	})
}
var setStyleAndValue = function (cellArr, worksheet) {
	if (!Array.isArray(cellArr)) return
	cellArr.forEach(function (row, rowid) {
		row.every(function (cell, columnid) {
			if (!cell) return true
			let fill = fillConvert(cell.bg)
			let font = fontConvert(cell.ff, cell.fc, cell.bl, cell.it, cell.fs, cell.cl, cell.ul)
			let alignment = alignmentConvert(cell.vt, cell.ht, cell.tb, cell.tr)
			let value
			if (cell.f) {
				value = { formula: cell.f, result: cell.v }
			} else {
				value = cell.v
			}
			let target = worksheet.getCell(rowid + 1, columnid + 1)
			target.fill = fill
			target.font = font
			target.alignment = alignment
			target.value = value
			return true
		}) 
	})
}

var fillConvert = function (bg) {
	if (!bg) {
		return {}
	}
	let fill = {
		type: 'pattern',
		pattern: 'solid',
		fgColor: {argb: bg.replace('#', '')}
	}
	return fill
}

var 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 = {
		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) {
			return num === 0 ? false : true
		}
	}
	
	let font = {
		name: luckyToExcel[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 
}

var 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 = {
		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
		}
	}
	
	let alignment = {
		vertical: luckyToExcel.vertical[vt],
		horizontal: luckyToExcel.horizontal[ht],
		wrapText: luckyToExcel.wrapText[tb],
		textRotation: luckyToExcel.textRotation[tr]
	}
	return alignment
	
}

var borderConvert = function (borderType, style = 1, color = '#000') { // 对应luckysheet的config中borderinfo的的参数
	if (!borderType) {
		return {}
	}
	const luckyToExcel = {
		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'
		}
	}
	let template = {style: luckyToExcel.style[style], color: {argb: color.replace('#', '')}}
	let border = {}
	if (luckyToExcel.type[borderType] === 'all') {
		border['top'] = template
		border['right'] = template
		border['bottom'] = template
		border['left'] = template
	} else {
		border[luckyToExcel.type[borderType]] = template
	}
	return border
}