node.js Stream writable.writableLength用法及代碼示例

writable.writableLength屬性是流模塊的內置應用程序，用於檢查隊列中準備好寫入的字節數。

用法:

writable.writableLength

返回值：此屬性返回準備寫入隊列的字節數。

以下示例說明了Node.js中writable.writableLength屬性的用法：

範例1：

// Node.js program to demonstrate the      
// writable.writableLength Property 
  
// Accessing stream module 
const stream = require('stream'); 
  
// Creating a stream and creating  
// a write function 
const writable = new stream.Writable({ 
  
  // Write function with its  
  // parameters 
  write:function(chunk, encoding, next) { 
  
    // Converting the chunk of 
    // data to string 
    console.log(chunk.toString()); 
    next(); 
  } 
}); 
  
// Calling cork() function 
writable.cork(); 
  
 //Writing data 
writable.write('hi'); 
  
// Again writing some data 
writable.write('GFG'); 
  
// Calling writable.writableLength  
// Property 
writable.writableLength;

輸出：

範例2：

// Node.js program to demonstrate the      
// writable.writableLength Property 
  
// Accessing stream module 
const stream = require('stream'); 
  
// Creating a stream and creating  
// a write function 
const writable = new stream.Writable({ 
  
  // Write function with its  
  // parameters 
  write:function(chunk, encoding, next) { 
  
    // Converting the chunk of 
    // data to string 
    console.log(chunk.toString()); 
    next(); 
  } 
}); 
  
// Calling cork() function 
writable.cork(); 
  
 //Writing data 
writable.write('hi'); 
  
// Calling uncork() function 
writable.uncork(); 
  
// Again calling cork function 
writable.cork(); 
  
// Again writing some data 
writable.write('GFG'); 
  
// Calling writable.writableLength  
// Property 
writable.writableLength;

輸出：

hi
3

在這裏，數據“ hi”不再存在於緩衝區中，因此，緩衝區中隻有3個字節存在的數據，“ GFG”需要3個字節。

參考： https://nodejs.org/api/stream.html#stream_writable_writablelength

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