Node.jsStream可读.readableflowProperty

原文:https://www . geesforgeks . org/node-js-stream-readable-flow-property/

可读流中的可读. readable 属性，用于检查流是否处于流动模式。

语法:

readable.readableFlowing


返回值:如果流处于流动模式，则返回真，否则返回假。

下面的例子说明了在 Node.js 中可读. readableflow 属性的使用:

例 1:

// Node.js program to demonstrate the     
// readable.readableFlowing Property  
// Include fs module
var fs = require("fs");
var data = '';
// Create a readable stream
var readerStream = fs.createReadStream('input.txt');
// Handling data event
readerStream.on('data', function(chunk) {
   data += chunk;
});
// Calling readableFlowing property
readerStream.readableFlowing;


输出:

true


例 2:

// Node.js program to demonstrate the     
// readable.readableFlowing 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 with parameter
  while (null !== (chunk = readable.read())) {
    // Displaying the chunk
    console.log(`read: ${chunk}`);
  }
});
// Calling readable.readableFlowing
// Property
readable.readableFlowing;


输出:

false


参考:https://nodejs . org/API/stream . html # stream _ readable _ flow。