Node.js Stream 可读. unpip()方法
原文:https://www . geesforgeks . org/node-js-stream-readable-unpie-method/
可读流中的可读. unpipe()方法用于分离之前在使用 stream.pipe()方法时附加的可写流。
语法:
readable.unpipe( destination )
参数:该方法接受单参数目的地，即待分离的可写流的目的地。
返回值:返回流。可写，即目的地。
以下示例说明了在 Node.js 中使用readable . unpip()方法:
例 1:
// Node.js program to demonstrate the
// readable.unpipe() method
// Accessing fs module
const fs = require('fs');
// Constructing readable stream
const readable = fs.createReadStream("input.text");
// Constructing writable Stream
const writable = fs.createWriteStream("output.text");
// Calling pipe method
readable.pipe(writable);
// Calling unpipe method
readable.unpipe(writable);
console.log("done");
输出:
done
例 2:
// Node.js program to demonstrate the
// readable.unpipe() method
// Accessing fs module
const fs = require('fs');
// Constructing readable stream
const readable = fs.createReadStream("input.text");
// Constructing writable Stream
const writable = fs.createWriteStream("output.text");
// All the data from readable goes into 'output.text',
// for only two seconds.
readable.pipe(writable);
setTimeout(() => {
console.log('Stop writing to output.text.');
// Calling unpipe method
readable.unpipe(writable);
console.log('close the file stream.');
//Calling end method
writable.end();
}, 2000);
console.log("done");
输出:
done
Stop writing to output.text.
close the file stream.
参考:https://nodejs . org/API/stream . html # stream _ readable _ unpip _ destination。
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