Answers for "measure time execution javascript to time"

Javascript measure function run time

var startTime = performance.now();

alert('Run some function here');

var endTime = performance.now();
var totalTime=endTime-startTime;// time took to run in milliseconds

alert('Total time:'+totalTime +'ms');

javascript time of execution

const { JSDOM } = require("jsdom");
const { window } = new JSDOM();
 
var start = window.performance.now();
 
// task starts
for (var i = 0; i < 100000000;i++);
// task ends
 
var end = window.performance.now();
console.log(`Execution time: ${end - start} ms`);