// Start the timer

console.time('timer');

​

// Your code or function here

for (let i = 0; i < 1000000; i++) {

  // Some time-consuming task

}

​

// Stop the timer and log the elapsed time

console.timeEnd('timer');

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');

// Measure time in milliseconds

const startTime = Date.now();

​

// Your code or operations here...

​

const endTime = Date.now();

const elapsedTime = endTime - startTime;

​

console.log(`Elapsed time: ${elapsedTime} ms`);

console.time("timer");   //start time with name = timer

console.timeEnd("timer"); //end timer and log time difference