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');var t0 = performance.now();
doSomething(); // <---- The function you're measuring time for
var t1 = performance.now();
console.log("Call to doSomething took " + (t1 - t0) + " milliseconds.");var t0 = performance.now()
doSomething() // <---- The function you're measuring time for
var t1 = performance.now()
console.log("Call to doSomething took " + (t1 - t0) + " milliseconds.")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`);