详情：

https://www.cnblogs.com/lalalagq/p/9749680.html

流：读取流，写入流，双向读写流。

读写流——压缩、加密

数据库不能直接接受流

sf.readFile('www${pathname}',(err,buffer)=>{
res.write(buffer);
});
.占用内存；
.资源使用不均匀

const fs = require('fs);
let rs = fs.createReadStream('1.txt');
let ws = fs.createWriteStream('2.txt');

rs.pipe(ws);

rs.on('error',()=>){
console.log(err);
})

ws.on('finish',()=>{
console.log('完成');
})

Comedy:
读写流——压缩、加密
数据库不能直接接受流

const fs = require('fs);
const zilib = require('zlib');

let rs = fs.createReadStream('1.txt');
let gz = zlib.createGzip();
let ws = fs.createWriteStream('2.txt.gz');

rs.pipe(gz).pipe(ws);

rs.on('error',()=>){
console.log(err);
})

ws.on('finish',()=>{
console.log('完成');
})

Comedy:
cosnt http = require('http');
const zlib = require('zlib');
const url = require('url');
const fs = require('fs');

http.createSever((req,res)=>{
let {pathname} = url.parse(req.url,true);
let filepath='www'+pathname;

fs.stat(filepath,(err,stat)=>{
if(err){
//res.setHerader('content-encoding','deflate');
res.writeHeader();
res.write('NOT FOUND');
res.end();
}else{
let rs=fs.createReadStream(filepath);
rs.on('error',()=>{ });
res.setHerader('content-encoding','gzip');
let gz = zlib.createGzip();
rs.pipe(res);

}
});

}).listen();

forever

npm i forever -g
forever start server.js
终端关了依旧在，会自动启动

forever list 查看运行列表

forever restart server.js 停掉再重开
forever stop server.js 停掉
forever stopall 停掉全部

forever start xxx.js -l c:/a.log -e c:/err.log -a

eg：

'/login' => function(){}
'/reg' => function(){}
' *' => read