Node.js 进程警告事件

Node.js 进程警告事件

警告事件是进程模块中Process类的一个事件,当Node.js发出进程警告时会触发该事件。

语法:

Event: 'warning'
JavaScript

参数: 此事件不接受任何参数。

返回值: 此事件没有返回值,但返回一个回调函数供进一步操作。

示例1:

index.js

// Node.js program to demonstrate the   
// Process 'warning' Event 
  
// Importing process module 
const process = require('process'); 
  
// Intentionally emitted warning 
process.emitWarning('something strange happened'); 
  
// Event 'warning'  
process.on('warning', (warning) => { 
   console.warn("warning name - " + warning.name); 
   console.warn("warning message - " + warning.message); 
}); 
JavaScript

使用以下命令运行 index.js 文件:

node index.js
JavaScript

输出:

(node:8004) Warning: something strange happened
(Use `node --trace-warnings ...` to show where
the warning was created)
warning name - Warning
warning message - something strange happened
JavaScript

示例2:

index.js

// Node.js program to demonstrate the   
// Process 'warning' Event 
  
// Importing process module 
const process = require('process'); 
  
// Intentionally emitted warning 
process.emitWarning('Running out of Storage'); 
  
// Event 'warning'  
process.on('warning', (warning) => { 
  console.warn("warning stacktrace - " + warning.stack) 
}); 
JavaScript

使用以下命令运行 index.js 文件:

node index.js
JavaScript

输出:

(node:13400) 警告:存储空间不足   
(使用`node –trace-warnings …`显示警告的创建位置)   
警告堆栈跟踪  警告:存储空间不足   
Object.<anonymous> (F:\java\GFG.js:8:9)   
Module._compile (node:internal/modules/cjs/loader:1109:14)   
Object.Module._extensions..js (node:internal/modules/cjs/loader:1138:10)   
Module.load (node:internal/modules/cjs/loader:989:32)   
Function.Module._load (node:internal/modules/cjs/loader:829:14)   
Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:76:12)   
node:internal/main/run_main_module:17:47 
Bash

参考: : https://nodejs.org/dist/latest-v16.x/docs/api/process.html#process_event_warning

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