Timer in javascript

Question

I have to do a timer in javascript with timing events, the time units should be in milliseconds.

i need something like this:

start_timer //some code.. stop_timer //and then show the ms

sorry for my english, and thank you for help!

edit:

i tried this method as test:

var d = new Date();
    var time =  d.toLocaleTimeString();
    var myVar = window.setInterval(function(time){  time -= d.toLocaleTimeString()
    return code.value = time.toString();
    }, 5000);

I think OP might mean benchmarking, like console.time().

gyre
– gyre

2017-04-09 20:07:26 +00:00
Commented Apr 9, 2017 at 20:07 — gyre
– gyre, Commented Apr 9, 2017 at 20:07

Vasile Alexandru Peşte · Accepted Answer · 2017-04-09 20:34:29Z

1

The console.time method is perfect but if you want to keep the result in memory you have to use the Date.now method.

let now = Date.now();

for (let i = 0; i < 100000; ++i)
    // ...

// Result in milliseconds.
let result = Date.now() - now;

// If you want to show it in a input box.
input.value = result + "ms";

edited Apr 9, 2017 at 20:34

answered Apr 9, 2017 at 20:32

Vasile Alexandru Peşte

1,3381 gold badge13 silver badges22 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Riccardo Romoli Over a year ago

what's let syntax?

Jake Lacey Over a year ago

@RiccardoRomoli ES6 syntax its pretty much the new var to understand a little more read into javascript hoisting.

gyre · Accepted Answer · 2017-04-09 20:09:59Z

0

You can use console.time(), for the browsers that support it:

console.time('Stuff')

for (var i = 0; i < 1000; i++) {
   // run some code
}

console.timeEnd('Stuff')

answered Apr 9, 2017 at 20:09

gyre

16.8k4 gold badges40 silver badges47 bronze badges

3 Comments

Riccardo Romoli Over a year ago

Forgive my ignorance, I just started, it is normal that each time you start, the time change?

gyre Over a year ago

Yes; there are many factors that can influence run time on a machine and thus the numbers logged are rarely consistent. They will start to appear more logical if you place some actual code where I had // run some code.

Riccardo Romoli Over a year ago

how can i implement the result on a input box in my html? if you see the code i've posted i need to set "code.value" as the result of timer.

Collectives™ on Stack Overflow

Timer in javascript

2 Answers 2

2 Comments

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related