Node.js - stroommodule
Voorbeeld
Skryf na 'n skryfbare stroom:
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/html'});
res.write('Hello
World!');
res.end();
}).listen(8080);
Definisie en gebruik
Die Stroom-module bied 'n manier om stroomdata te hanteer.
Daar is twee tipes strome: leesbaar en skryfbaar.
'n Voorbeeld van 'n leesbare stroom is die reaksie- objek wat jy kry wanneer jy met die http.createServer()-metode werk.
'n Voorbeeld van 'n skryfbare stroom is die versoekobjek wat jy kry wanneer jy met die http.createServer() metode werk.
Sintaksis
Sommige metodes gee 'n leesbare/skryfbare stroomvoorwerp terug, soos http.createServer(), en as dit die geval is, hoef jy nie die stroommodule in te sluit nie.
Andersins, die sintaksis vir die insluiting van die Stroom-module in jou toepassing:
var stream = require('stream');
Leesbare stroomeienskappe en -metodes
| Method | Description |
|---|---|
| isPaused() | Returns true if the state of the readable stream is paused, otherwise false |
| pause() | Pauses the readable stream |
| pipe() | Turns the readable stream into the specified writable stream |
| read() | Returns a specified part of the readable stream |
| resume() | Resumes a paused stream |
| setEncoding() | Sets the character encoding of the readable stream |
| unpipe() | Stops turning a readable stream into a writable stream, caused by the pipe() method |
| unshift() | Pushes some specified data back into the internal buffer |
| wrap() | Helps reading streams made by older Node.js versions |
Skryfbare stroomeienskappe en -metodes
| Method | Description |
|---|---|
| cork() | Stops the writable stream and all written data will be buffered in memory |
| end() | Ends the writable stream |
| setDefaultEncoding() | Sets the encoding for the writable stream |
| uncork() | Flushes all data that has been buffered since the cork() method was called |
| write() | Writes data to the stream |