nodejs的xlsx模块批量解析与导出excel数据表简单使用

const fs = require('fs');
const path = require('path');
const xlsx = require('xlsx');

function parseExcel(filename) {
    const workbook = xlsx.readFile('./import/'+filename); // 读取excel文件
    const sheetNames = workbook.SheetNames; //获取表名称数组

    let wb = {
        SheetNames:[],
        Sheets:{}
    };
    // 设置头部，根据需要修改，必须加头部，否则后面无法获取准确结尾单元格值
    let _headers = ['title1', 'title2','title3','title4']
    let headers = _headers.map((v, i) => Object.assign({}, {v: v, position: String.fromCharCode(65+i) + 1 }))
        .reduce((prev, next) => Object.assign({}, prev, {[next.position]: {v: next.v}}), {});
    for (let i = 0; i < sheetNames.length; i++) {
        let data =xlsx.utils.sheet_to_json(workbook.Sheets[sheetNames[i]]); //通过工具将表对象的数据读出来并转成json
        data.map((item,index)=>{ // 这里根据具体业务来进行操作
            if(item['title1']!== "xxx"){
                item['title2'] = new Buffer(item['title1'],'base64').toString();
            }else{
                item['title2'] = "";
            }
        })
        let exportData = xlsx.utils.json_to_sheet(data); //通过工具将json转表对象
        let output = Object.assign({}, headers, exportData);//获取表对象，包含头
        let keys = Object.keys(output);// 获取所有的单元格名称数组
        let ref = keys[0]+':'+keys[keys.length - 2]; //定义一个字符串 也就是表的范围，左上角:右下角
        wb['SheetNames'].push(sheetNames[i]);//插入sheet名称
        wb['Sheets'][sheetNames[i]] = Object.assign({},exportData,{'!ref':ref}) //表对象，上面的sheet名称为key，对应表对象
    }
    // 给文件名称加'解密'
    filename = filename.split('.')[filename.split('.').length-2]+'解密'+'.'+filename.split('.').pop();
    xlsx.writeFile(wb,path.resolve(__dirname,'output',filename)); //将数据导出为excel文件
}

//读取某个路径下所有文件名
var readDir = fs.readdirSync("./import");
readDir.forEach(function (filename) {
    let fileExtension = filename.split('.').pop().toLowerCase();
    if(fileExtension === 'xlsx' || fileExtension === 'xls' ){
        // 批量解析文件
        parseExcel(filename)
    }
})