Node.js socket.unref()方法
原文:https://www.geeksforgeeks.org/node-js-socket-unref-method/
socket.unref() 方法是 dgram 模块中 socket 类的内置应用编程接口，用于允许进程退出，即使套接字仍在侦听。
语法:
const socket.unref()
参数:此方法不接受任何参数。
返回值:这个方法返回包含所有信息的特定套接字的引用。
示例 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");
输出:
[ 'message' ]
UDP String: Hello
示例 2: 文件名:
// 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");
使用以下命令运行 index.js 文件:
node index.js
输出:
server listening 0.0.0.0:1234
[ 'message', 'listening' ]
UDP String: Hello
参考:https://nodejs . org/dist/latest-v 12 . x/docs/API/dgram . html # dgram _ socket _ unref
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