Node Learning

copy.js

const fs = require('fs');

function copy(src, dst) {
    //小文件拷贝
    fs.writeFileSync(dst,fs.readFileSync(src));
    //大文件拷贝
    //fs.createReadStream(src).pipe(fs.createWriteStream(dst));
}
function main(argv) {
    copy(argv[0], argv[1]);
}

main(process.argv.slice(2));

pipe.js

//实现大文件拷贝时候的stream的pipe操作
const fs = require('fs');

function pipe(rs,ws) {
    rs.on('data',chunk=>{
        !ws.write(chunk) && rs.pause();
    });
    rs.on('end',()=>{
        ws.end();
    });
    ws.on('drain',()=>{
        rs.resume();
    });
}
pipe(fs.createReadStream('./app.js'), fs.createWriteStream('./app.js.bak'));