Node.js util.debuglog()用法及代碼示例

// Node.js program to demonstrate the  
// util.debuglog() method  
  
// Using require to access util module  
const util = require('util'); 
  
const debugLog = util.debuglog('run-app'); 
  
// Use debuglog() method 
debugLog('hello from my debugger [%d]', 123); 
// SET NODE_DEBUG=run-app&&node util.js 
  
// Another way to import debuglog 
const { debuglog } = require('util'); 
  
const debuglogue = debuglog('run-app1'); 
  
// Use debuglog() method 
debuglogue('hello from run-app [%d]', 123); 
  
const a = "old Value"; 
  
let deebuglog = util.debuglog('run-app2', 
    (debuging) => { 
  
        // Replace with a logging function 
        // that optimizes out 
        a = "new Value"; 
  
        // Testing if the section is enabled 
        deebuglog = debuging; 
    }); 
  
// prints the debuglog function  
console.log(util.inspect(deebuglog,  
    showHidden = true, compact = true)); 
  
// Prints nothing 
console.log(a); 
  
// logs app * 
deebuglog(); 
  
deebuglog('hi there, it\'s run-app [%d]', 2333);

// Node.js program to demonstrate the  
// util.debuglog() method  
  
// Using require to access util module  
const util = require('util'); 
// const {debuglog} = require('util'); 
  
const debuglog = util.debuglog('alfa-beta'); 
  
debuglog('Hii there, debuglog from alfa-beta [%d]', 2333); 
  
const generalLog = util.debuglog('alfa-'); 
const timerLog = util.debuglog('alfa-romeo'); 
const delay = 800; 
  
generalLog('Leaving alfa-...'); 
console.log("Wait for timerLog...") 
setTimeout(() => { 
    timerLog('timer fired after %d ', delay); 
}, delay);