exceljs的使用

文档：https://github.com/exceljs/exceljs/blob/master/README_zh.md#boolean-value
 
1. npm install exceljs  
    npm install file-saver

2.新增downloadExcel.js文件针对单页签的数据

  

import saveAs from 'file-saver';
const Excel = require("exceljs");
import {
    VFrame
} from "n8-vframe";


var workbook = "";
var worksheet = "";



function init() {
    workbook = new Excel.Workbook();
    workbook.created = new Date();
    workbook.modified = new Date();
    worksheet = workbook.addWorksheet("sheet1");
}



async function downloadExcel(importTemplate, fileName) {
    init();
    for (var i = 0; i < importTemplate.length; i++) {
        if (importTemplate[i].hasOwnProperty('columnType')) {
            if (importTemplate[i].columnType == "boolean") {
                var columnName = String.fromCharCode(i + 65)
                var res = ['"TRUE,FALSE"'];
                if (importTemplate[i].hasOwnProperty('tips')) {
                    worksheet.getCell(columnName + 1).note = importTemplate[i].tips;
                }
                setColumns(columnName, res)
            }
            if (importTemplate[i].columnType == "number") {
                var columnName = String.fromCharCode(i + 65);
                if (importTemplate[i].hasOwnProperty('tips')) {
                    worksheet.getCell(columnName + 1).note = importTemplate[i].tips;
                }
                setColumnsbyType(columnName)
            }



        }
        if (importTemplate[i].hasOwnProperty('url')) {
            var columnName = String.fromCharCode(i + 65)
            var url = importTemplate[i].url;
            var index = url.lastIndexOf("/");
            var name = url.substring(index + 1, url.length);
            if (name == "GetEnumBaseData") {
                let res = await getEnumByUrl(url, importTemplate[i].enumName);
                if (importTemplate[i].hasOwnProperty('tips')) {
                    worksheet.getCell(columnName + 1).note = importTemplate[i].tips;
                }
                setColumns(columnName, res);
            } else {
                let res = await getComboxByUrl(url);
                var tips = JSON.stringify(res[1]);
                tips = tips.replace(/"/g, "");
                var reg = /[,,]/g;
                var text = tips.replace(reg, '
').replace(/[|]/g, '').replace(/{|}/g, '');
                worksheet.getCell(columnName + 1).note = text;
                setColumns(columnName, res[0]);
            }



        } else {
            if (importTemplate[i].hasOwnProperty("tips")) {
                var columnName = String.fromCharCode(i + 65)
                worksheet.getCell(columnName + 1).note = importTemplate[i].tips;
            }
        }



    }
    saveExcel(fileName, importTemplate)



}



function setColumnsbyType(columnName, Tips) {
    for (var i = 2; i < 1000; i++) {
        worksheet.getCell(columnName + i).dataValidation = {
            type: 'whole',
            operator: 'between',
            showErrorMessage: true,
            formulae: [-1000, 100000],
            errorStyle: 'error',
            errorTitle: 'Five',
            error: 'Data must be an integer'
        };



    }



}



function setColumns(columnName, res) {
    for (var i = 2; i < 1000; i++) {
        worksheet.getCell(columnName + i).dataValidation = {
            type: 'list',
            allowBlank: true,
            formulae: res
        };



    }



}



function saveExcel(fileName, importTemplate) {
    worksheet.columns = importTemplate;
    workbook.xlsx.writeBuffer().then(function (buffer) {
        saveAs(new Blob([buffer], {
            type: 'application/octet-stream'
        }), fileName + '.' + 'xlsx');
    });
}



function getComboxByUrl(url) {
    return new Promise((resolve, reject) => {
        var data = [];
        var description = [];
        var curData = [];
        VFrame.http.request(url, {}).then(res => {
            res.items.forEach(item => {
                description.push({
                    value: item.value,
                    description: item.displayText
                })
                data.push(item.value);
                var newData = '"' + data.join(',') + '"'
                curData[0] = newData;
            })
            resolve([curData, description])
        })



    })
}



function getEnumByUrl(url, parameter) {
    return new Promise((resolve, reject) => {
        var data = [];
        var curData = [];
        VFrame.http.request(url, {
            enumName: parameter
        }).then(res => {
            res.items.forEach(item => {
                data.push(item.key);
                var newData = '"' + data.join(',') + '"'
                curData[0] = newData;
            })
            resolve(curData)
        })



    })
}
export default downloadExcel;


 
 
//针对多页签的
 


import saveAs from 'file-saver';


const Excel = require("exceljs");
import {
    VFrame
} from "n8-vframe";



var workbook = "";
var worksheet = "sheet";



function init() {
    workbook = new Excel.Workbook();
    workbook.created = new Date();
    workbook.modified = new Date();
}



async function downExcel(params, fileName) {
    init();
    for (var i = 0; i < params.length; i++) {
        var sheet = worksheet + i;
        sheet = workbook.addWorksheet(params[i].name);
        var columnData = params[i].data;
        var columnName = "";
        for (var j = 0; j < columnData.length; j++) {
            //防止超过26列出错
            var f1 = Math.floor(j / 26);
            var f2 = j - f1 * 26;
            if (f1 > 0) {
                columnName = String.fromCharCode(f1 + 64) + String.fromCharCode(f2 + 65);
            } else {
                columnName = String.fromCharCode(f2 + 65);
            }
            if (columnData[j].hasOwnProperty('tips')) {
                sheet.getCell(columnName + 1).note = columnData[j].tips;
            }
            if (columnData[j].hasOwnProperty('columnType')) {
                if (columnData[j].columnType == "boolean") {
                    var res = ['"TRUE,FALSE"'];
                    setColumns(columnName, res, sheet)
                }
            } else if (columnData[j].columnType == "number") {
                setColumnsbyType(columnName, sheet)
            }



            if (columnData[j].hasOwnProperty('url')) {
                var url = columnData[j].url;
                var index = url.lastIndexOf("/");
                var name = url.substring(index + 1, url.length);
                if (name == "GetEnumBaseData") {
                    let res = await getEnumByUrl(url, columnData[j].enumName);
                    if (columnData[j].hasOwnProperty('tips')) {
                        sheet.getCell(columnName + 1).note = columnData[j].tips;
                    }
                    setColumns(columnName, res, sheet);
                } else {
                    let res = await getComboxByUrl(url);
                    var tips = JSON.stringify(res[1]);
                    tips = tips.replace(/"/g, "");
                    var reg = /[,,]/g;
                    var text = tips.replace(reg, '
').replace(/[|]/g, '').replace(/{|}/g, '');
                    sheet.getCell(columnName + 1).note = text;
                    setColumns(columnName, res[0], sheet);
                }



            }
        }
        sheet.columns = columnData;
    }



    saveExcel(fileName, sheet)



}



function setColumnsbyType(columnName, sheet) {
    for (var i = 2; i < 1000; i++) {
        sheet.getCell(columnName + i).dataValidation = {
            type: 'whole',
            operator: 'between',
            showErrorMessage: true,
            formulae: [-1000, 100000],
            errorStyle: 'error',
            errorTitle: 'Five',
            error: 'Data must be an integer'
        };



    }



}



function setColumns(columnName, res, sheet) {
    for (var i = 2; i < 1000; i++) {
        sheet.getCell(columnName + i).dataValidation = {
            type: 'list',
            allowBlank: true,
            formulae: res
        };



    }



}



function saveExcel(fileName) {
    workbook.xlsx.writeBuffer().then(function (buffer) {
        saveAs(new Blob([buffer], {
            type: 'application/octet-stream'
        }), fileName + '.' + 'xlsx');
    });
}



function getComboxByUrl(url) {
    return new Promise((resolve, reject) => {
        var data = [];
        var description = [];
        var curData = [];
        VFrame.http.request(url, {}).then(res => {
            res.items.forEach(item => {
                description.push({
                    value: item.value,
                    description: item.displayText
                })
                data.push(item.value);
                var newData = '"' + data.join(',') + '"'
                curData[0] = newData;
            })
            resolve([curData, description])
        })



    })
}



function getEnumByUrl(url, parameter) {
    return new Promise((resolve, reject) => {
        var data = [];
        var curData = [];
        VFrame.http.request(url, {
            enumName: parameter
        }).then(res => {
            res.items.forEach(item => {
                data.push(item.key);
                var newData = '"' + data.join(',') + '"'
                curData[0] = newData;
            })
            resolve(curData)
        })



    })
}



export default downExcel;

3.使用     import downloadExcel from "@/config/downloadExcel";
  
  importTemplatejson --数据   fileName --文件的名字
 downloadExcel(this.importTemplate,this.fileName)