Node.js socket.unref()用法及代碼示例

socket.unref()方法是dgram模塊中Socket類的內置應用程序編程接口，用於即使套接字仍在偵聽也允許進程退出。

用法:

const socket.unref()

參數：此方法不接受任何參數。

返回值：此方法返回其中包含所有信息的特定套接字的引用。

範例1： 文件名：index.js

// Node.js program to demonstrate the 
// server.unref() property 
  
// Importing dgram module 
var dgram = require('dgram'); 
  
// Creating and initializing client 
// and server socket 
var client = dgram.createSocket("udp4"); 
var server = dgram.createSocket("udp4"); 
  
// Handling the message event 
server.on("message", function (msg) { 
  
    // Displaying the client message 
    process.stdout.write("UDP String:" 
                    + msg + "\n"); 
  
    // Exiting process 
    process.exit(); 
  
})// Binding server with port 
    .bind(1234, () => { 
  
        // Getting the reference of the server 
        // by using unref() method 
        const size = server.unref(); 
  
        // Display the result 
        console.log(size.eventNames()); 
    }); 
  
// Client sending message to server 
client.send("Hello", 0, 7, 1234, "localhost");

輸出：

[ 'message' ]
UDP String:Hello

範例2： 文件名：index.js

// Node.js program to demonstrate the 
// server.unref() method 
  
// Importing dgram module 
var dgram = require('dgram'); 
  
// Creating and initializing client 
// and server socket 
var client = dgram.createSocket("udp4"); 
var server = dgram.createSocket("udp4"); 
  
// Handling the message event 
server.on("message", function (msg) { 
  
    // Displaying the client message   
    process.stdout.write("UDP String:"
            + msg + "\n"); 
  
    // Exiting process  
    process.exit(); 
}); 
  
// Handling the listening event 
server.on('listening', () => { 
  
    // Getting address information 
    // for the server 
    const address = server.address(); 
  
    // Display the result 
    console.log(`server listening  
        ${address.address}:${address.port}`); 
}); 
  
// Binding server with port address 
// by using bind() method 
server.bind(1234, () => { 
  
    // Getting the reference of server 
    // by using unref() methods 
    const size = server.unref(); 
  
    // Display the result 
    console.log(size.eventNames()); 
}); 
  
// Client sending message to server 
client.send("Hello", 0, 7, 1234, "localhost");

使用以下命令運行index.js文件：

node index.js

輸出：

server listening 0.0.0.0:1234
[ 'message', 'listening' ]
UDP String:Hello

參考：https://nodejs.org/dist/latest-v12.x/docs/api/dgram.html#dgram_socket_unref

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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 Node.js socket.unref() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。