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
import saveAs from 'file-saver';
const Excel = require("exceljs");
import {
    VFrame
} from "n8-vframe";
const workbook = new Excel.Workbook();
workbook.created = new Date();
workbook.modified = new Date();
var worksheet = workbook.addWorksheet("sheet1");

function downloadExcel(importTemplate, fileName) {
    for (var i = 0; i < importTemplate.length; i++) {

        if (importTemplate[i].url != "") {
            var columnName = importTemplate[i].column;
            var url = importTemplate[i].url;
            var index = url.lastIndexOf("\/");
            var name = url.substring(index + 1, url.length);
            if (name == "GetEnumBaseData") {
                getEnumByUrl(url, importTemplate[i].enumName).then(res => {
                    setColumns(columnName, res);
                    saveExcel(fileName, importTemplate)
                })
            } else {
                getComboxByUrl(url).then(([res, description]) => {
                    var tips = JSON.stringify(description);
                    tips = tips.replace(/\"/g, "");
                    var reg = /[,,]/g;
                    var text = tips.replace(reg, '\n').replace(/\[|]/g, '').replace(/\{|}/g, '');
                    setColumns(columnName, res, text);
                    saveExcel(fileName, importTemplate)
                })
            }

        } else {
            var Tips = importTemplate[i].Tips;
            var columnName = importTemplate[i].column;
            if (Tips != "") {
                setColumnsNote(columnName, Tips);
            }
        }

    }

}

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

}

function setColumnsNote(columnName, Tips) {
    for (var i = 2; i < 1000; i++) {
        worksheet.getCell(columnName + i).note = Tips;
    }
}

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;

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