Node.js process.channel 属性
process.channel 是进程模块内部的内置应用程序编程接口的一部分,用于获取IPC通道的引用。如果没有IPC通道存在,该属性将为undefined。
语法:
const process.channel
参数: 此API不接受任何参数。
返回值: 此API返回IPC通道的引用。如果不存在IPC通道,则此属性未定义。
示例1:
index.js
// Node.js program to demonstrate the
// Process.channel Property
// Importing process modules
const cp = require('child_process');
// Getting child process reference
const process = cp.fork(`${__dirname}/sub.js`);
// Causes the child to print:
// CHILD got message: { hello: 'world' }
process.send({ hello: 'world' });
console.log(process.channel)
sub.js
process.on('message', (m) => {
console.log('CHILD got message:', m);
process.exit()
});
使用以下命令运行 index.js 文件:
node index.js
输出:
Control {
_events: [Object: null prototype] {},
_eventsCount: 0,
_maxListeners: undefined,
[Symbol(kCapture)]: false
}
CHILD got message: { hello: 'world' }
示例2:
index.js
// Node.js program to demonstrate the
// Process.channel Property
// Importing process modules
const process = require('process');
// Getting process channel
if(process.channel)
console.log("Process Channel exist")
else
console.log("Process Channel doesn't exist")
运行以下命令来运行 index.js 文件:
输出:
Process Channel doesn't exist
参考链接: https://nodejs.org/dist/latest-v16.x/docs/api/process.html#process_process_channel