Node.js Stream 可读. readableLength 属性
原文:https://www . geesforgeks . org/node-js-stream-readable-length-property/
可读流中的可读. readableLength 属性，用于检查队列中准备读取的字节数。
语法:
readable.readableLength
返回值:返回队列中准备读取的字节数。
下面的例子说明了在 Node.js 中可读. readableLength 属性的使用:
例 1:
// Node.js program to demonstrate the
// readable.readableLength Property
// Accessing stream module
const stream = require('stream');
// Creating a Readable stream
const readable = new stream.Readable("input.txt");
// Calling readable.readableLength
// Property
readable.readableLength;
输出:
0
例 2:
// Node.js program to demonstrate the
// readable.readableLength property
// Include fs module
const fs = require("fs");
// Constructing readable stream
const readable = fs.createReadStream("input.txt");
// Instructions for reading data
readable.on('readable', () => {
let chunk;
// Using while loop and calling
// read method
while (null !== (chunk = readable.read())) {
// Displaying the chunk length
console.log(`read: ${chunk.length}`);
}
});
// Calling readableLength property
readable.readableLength;
输出:
0
read: 13
参考:https://nodejs . org/API/stream . html # stream _ readable _ readablelength。
版权属于：月萌API www.moonapi.com，转载请注明出处
