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node.js Stream writable.destroyed用法及代码示例


writable.destroyed属性是Stream模块的内置应用程序编程接口,用于检查writable.destroy()方法是否被调用。

用法:

writable.destroyed

返回值:如果在调用writable.destroy()方法之前,此属性返回true,否则它返回false。


以下示例说明了Node.js中writable.destroyed属性的用法:

范例1:

// Node.js program to demonstrate the      
// writable.distroyed 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('hello'); 
  
// Calling destroy function 
writable.destroy(); 
  
// Calling the Property 
writable.destroyed;

输出:

hi
hello
true

范例2:

// Node.js program to demonstrate the      
// writable.distroyed 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('hello'); 
  
// Calling the Property 
writable.destroyed;

输出:

hi
hello
false

在上面的示例中,可写的输出为false。调用属性writable.destroyed之前未调用destroy()方法。

参考: https://nodejs.org/api/stream.html#stream_writable_destroyed



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