退出事件前的 Node.js 流程
原文:https://www . geesforgeks . org/node-js-process-before exit-event/
“before exit”是流程模块中流程类的一个事件，当 Node.js 清空其事件循环并且没有额外的工作要调度时发出。
语法:
Event: 'beforeExit'
参数:此事件不接受任何参数作为参数。
返回值:此事件只返回一个回调函数，以便进一步操作。
例 1:
index . js
// Node.js program to demonstrate the
// Process 'beforeExit' Event
// Importing process module
const process = require('process');
// Event 'beforeExit'
process.on('beforeExit', (code) => {
console.log('Process beforeExit event with code: ', code);
});
// Event 'exit'
process.on('exit', (code) => {
console.log('Process exit event with code: ', code);
});
// Display the first message
console.log('This message is displayed first.');
使用以下命令运行 index.js 文件:
node index.js
输出:
This message is displayed first.
Process beforeExit event with code: 0
Process exit event with code: 0
例 2:
index . js
// Node.js program to demonstrate the
// Process 'beforeExit' Event
// Importing process module
const process = require('process');
// Updating the exit code
process.exitCode = 100;
// Event 'beforeExit'
process.on('beforeExit', (code) => {
console.log('Process beforeExit event with code: ', code);
});
// Display the first message
console.log('This message is displayed first.');
使用以下命令运行 index.js 文件:
node index.js
输出:
This message is displayed first.
Process beforeExit event with code: 100
参考:https://nodejs . org/dist/latest-v 16 . x/docs/API/process . html # process _ event _ before exit
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