节点. js 流程.通道属性
原文:https://www . geesforgeks . org/node-js-process-channel-property/
进程通道是进程模块内进程类的内置应用编程接口，用于获取对 IPC 通道的引用。如果不存在 IPC 通道，则该属性未定义。
语法:
const process.channel
参数:这个 api 不接受任何参数作为参数。
返回值:该 api 返回对 IPC 通道的引用。如果不存在 IPC 通道，则该属性未定义。
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' }
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")
使用以下命令运行 index.js 文件:
输出:
Process Channel doesn't exist
参考:https://nodejs . org/dist/latest-v 16 . x/docs/API/process . html # process _ process _ channel
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