#fs算法

##删除文件夹

function del(fileSrc) {
    fs.readdirSync(fileSrc).forEach(item => {
        item = fileSrc + '/' + item;
        console.log(item);
        if (fs.statSync(item).isFile()) {
            fs.unlinkSync(item);
        } else {
            del(item);
        }
    })
}

##复制文件

function copydir(dir, newdir) {
    !fs.existsSync(newdir) && fs.mkdirSync(newdir);
    fs.readdirSync(dir).forEach(item => {
        let dirname = dir + '/' + item;
        let newdirName = newdir + '/' + item;
        if (fs.statSync(dirname).isFile()) {
                let read = fs.createReadStream(dirname);
        } else {
            copydir(dirname, newdirName);
        }
    })
}