process.connected屬性是流程模塊的內置屬性，子流程使用該屬性來檢查其是否與父流程連接。
用法:
process.connected
返回值：如果該進程是從另一個進程派生的，則如果兩個進程已連接，則process.connected屬性將返回true，否則將返回false。
範例1：如果進程已連接，則process.connected將返回true。
Parent.js
// Require fork method from child_process
// to spawn child process
const fork = require('child_process').fork;
// Child process file
const child_file = 'Child.js';
// Spawn child process
const child = fork(child_file);Child.js
console.log('In Child.js')
// If it is connected
if (process.connected) {
// Print messages
console.log("Child.js is connected");
} else {
// Print messages
console.log("Child.js is disconnected");
}使用以下命令運行Parent.js文件：
node Parent.js
輸出：
In Child.js Child.js is connected
範例2：如果該進程已斷開連接，則process.connected將返回false。
Parent.js
// Require fork method from child_process
// to spawn child process
const fork = require('child_process').fork;
// Child process file
const child_file = 'Child.js';
// Spawn child process
const child = fork(child_file);Child.js
console.log('In Child.js')
// Disconnect the process
process.disconnect();
// If it is connected
if (process.connected) {
// Print messages
console.log("Child.js is connected");
} else {
// Print messages
console.log("Child.js is disconnected");
}使用以下命令運行Parent.js文件：
node Parent.js
輸出：
In Child.js Child.js is disconnected
參考： https://nodejs.org/api/process.html#process_process_connected
注：本文由純淨天空篩選整理自GeeksforGeeks大神的英文原創作品 Node.js process.connected Property。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。