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

writable.writableHighWaterMark屬性是流模塊的內置應用程序編程接口，用於檢查創建Writable時傳遞的highWaterMark值。

用法:

writable.writableHighWaterMark

返回值：如果設置，它將返回高水印值，否則返回默認值。

以下示例說明了Node.js中writable.writableHighWaterMark屬性的使用：

範例1：

// Node.js program to demonstrate the      
// writable.writableHighWaterMark 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(); 
  } 
}); 
  
// Writing data 
writable.write('hi'); 
  
// Again writing some data 
writable.write('GFG'); 
  
// Calling writable.writableHighWaterMark  
// Property 
writable.writableHighWaterMark;

輸出：

hi
GFG
16384

在此，返回默認值。

範例2：

// Node.js program to demonstrate the      
// writable.writableHighWaterMark Property 
  
// Accessing stream module 
const stream = require('stream'); 
  
// Creating a stream and setting the value 
// of the highWaterMark 
const writable = new stream.Writable({ 
    highWaterMark:1234 
}); 
  
// Calling writable.writableHighWaterMark  
// Property 
writable.writableHighWaterMark;

輸出：

這裏，返回在創建可寫流時設置的highWaterMark的值。

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

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