const path = require("path");
const fs = require("fs");

const pathName = "./";//要读取的文件夹路径，windows系统路径"\"要转义，如："C:\\Users\\user\\Desktop"
fs.readdir(pathName, function(err, files){
    let fileArr = [];
    let dirArr = [];
    let otherArr = [];
    (function iterator(i){
        if(i == files.length) {//读取完成输出
            console.log({"files":fileArr,"dirs":dirArr,"others":otherArr});
            return ;
        }
        fs.stat(path.join(pathName, files[i]), function(err, data){     
            if(data.isFile()){//判断是否为文件
                fileArr.push(path.extname(files[i]));
            }else if(data.isDirectory()){//判断是否为文件夹/目录
                dirArr.push(files[i]);
            }else{//其他类型，如快捷方式
                otherArr.push(files[i]);
            }
            iterator(i+1);
        });
    })(0);
});