Node.js socket.addMembership() 方法

socket.addMembership()方法是 dgram 模块中 Socket 类的内置应用程序编程接口，用于使内核在特定的多播地址加入多播组。

句法：

const socket.addMembership(multicastAddress[, multicastInterface])

参数：该方法将表示多播地址的字符串作为参数。

返回值：此方法不返回任何值。

示例 1：文件名：index.js

Javascript

// Node.js program to demonstrate the
// server.addMembership() 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");
 
// Catching the message event
server.on("message", function (msg) {
 
    // Displaying the client message
    process.stdout.write("UDP String: " + msg + "\n");
 
    // Exiting process
    process.exit();
})
    .bind(1234, () => {
 
        // Adding a multicast address for
        // others to join
        server.addMembership('224.0.0.114');
    });
 
// Client sending message to server
client.send("Hello", 0, 7, 1234, "localhost");

输出：

UDP String: Hello

示例 2：文件名：index.js

Javascript

// Node.js program to demonstrate the
// server.addMembership() 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");
 
// Catching the message event
server.on("message", function (msg) {
 
    // Displaying the client message
    process.stdout.write("UDP String: " + msg + "\n");
 
    // Exiting process
    process.exit();
});
 
// Catching the listening event
server.on('listening', () => {
    const address = server.address();
    console.log(`server listening
        ${address.address}:${address.port}`);
});
 
// Binding server with port address
server.bind(1234, () => {
 
    // Adding a multicast address for others to join
    server.addMembership('224.0.0.114');
});
 
// Client sending message to server
client.send("Hello", 0, 7, 1234, "localhost");

输出：

server listening 0.0.0.0:1234
UDP String: Hello

使用以下命令运行 index.js 文件：

node index.js

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