Node.js Stream 可读.可读属性
原文:https://www . geesforgeks . org/node-js-stream-可读-可读-property/
可读.可读属性是 Stream 模块的内置应用编程接口，用于检查调用 readable.read()方法是否安全。
语法:
readable.readable
返回值:如果可读则返回真，否则返回假。
下面的例子说明了可读属性在 Node.js 中的使用:
例 1:
// Node.js program to demonstrate the
// readable.readable Property
// Include fs module
const fs = require('fs');
// Creating readable stream
const readable = fs.createReadStream("input.txt");
// Calling readable property
readable.readable;
输出:
true
例 2:
// Node.js program to demonstrate the
// readable.readable 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
console.log(`read: ${chunk}`);
}
});
// Shows that the program
// ended
console.log("Program ends!!");
// Calling readable property
readable.readable;
输出:
Program ends!!
true
read: hello
参考:T2】https://nodejs.org/api/stream.html#stream_readable_readable
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