node.js Stream readable.unpipe()用法及代碼示例

可讀流中的readable.unpipe()方法用於分離使用stream.pipe()方法時先前附加的可寫流。

用法:

readable.unpipe( destination )

參數：此方法接受單個參數目標，該目標是要分離的可寫流的目標。

返回值：它返回stream.Writable，即目的地。

下麵的示例說明在Node.js中使用visible.unpipe()方法：

範例1：

// Node.js program to demonstrate the      
// readable.unpipe() method 
   
// Accessing fs module 
const fs = require('fs'); 
  
// Constructing readable stream 
const readable = fs.createReadStream("input.text"); 
  
// Constructing writable Stream 
const writable = fs.createWriteStream("output.text"); 
  
// Calling pipe method 
readable.pipe(writable); 
  
// Calling unpipe method 
readable.unpipe(writable); 
console.log("done");

輸出：

done

範例2：

// Node.js program to demonstrate the      
// readable.unpipe() method 
   
// Accessing fs module 
const fs = require('fs'); 
  
// Constructing readable stream 
const readable = fs.createReadStream("input.text"); 
  
// Constructing writable Stream 
const writable = fs.createWriteStream("output.text"); 
  
// All the data from readable goes into 'output.text', 
// for only two seconds. 
readable.pipe(writable); 
setTimeout(() => { 
  console.log('Stop writing to output.text.'); 
    
  // Calling unpipe method 
  readable.unpipe(writable); 
  console.log('close the file stream.'); 
    
  //Calling end method 
  writable.end(); 
}, 2000); 
console.log("done");

輸出：

done
Stop writing to output.text.
close the file stream.

參考： https://nodejs.org/api/stream.html#stream_readable_unpipe_destination。

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