US Coast Guard, US Navy, Canadian Coast Guard and OceanGate Expeditions establish a unified command to handle the search.Ħ am GMT/ 2am ET: US Coast Guard confirms Canadian P-3 aircraft detected underwater noises. CNN and Rolling Stone magazine report banging sounds at 30-minute intervals had been detected. Photograph: OceanGate Expeditions/AFP/Getty Imagesĭuring the day: Sounds detected over several hours by Canadian Lockheed P-3 Orion aircraft, equipped with gear to trace submarines. Var diffInSeconds = Math.floor((new Date() - this.The Titan submersible is seen launching from a platform in an undated photo. Since setInterval is not reliable in inactive windows/tabs we are using date diff. And you'd probably want to add some kind of get/set function if you wanted to get the count or change the repeat value. Comes in handy.Įdit: Note, this doesn't do any input checking (like if delay and repeat are the correct type. Self-corrects the setTimeout, can run it X number of times (-1 for infinite), can start running instantaneously, and has a counter if you ever need to see how many times the func() has been run. * Self-adjusting interval to account for drifting I've wrapped it up into a constructor function so we can do 'objecty' things with it. I'ma just build on Bergi's answer (specifically the second part) a little bit because I really liked the way it was done, but I want the option to stop the timer once it starts (like clearInterval() almost). SetTimeout(step, Math.max(0, interval - dt)) // take into account drift possibly special handling to avoid futile "catch up" run Var dt = Date.now() - expected // the drift (positive for overshooting) Here the exact delay for each of the repeated timeouts is adapted to the actually elapsed time, compared to the expected intervals: var interval = 1000 // ms Those are known as self-adjusting timers. This requires a bit more advanced strategy (and code), though it pays out well (and registers less timeouts). However, sometimes you really need a steady interval executing your callbacks without drifting.
GOOGLE SET A TIMER FOR 4 MINUTES UPDATE
So it would be advisable to update more often, like about every 100ms, to avoid such jumps. When the interval lags a bit and executes your callback after 990, 1993, 2996, 3999, 5002 milliseconds, you will see the second count 0, 1, 2, 3, 5 (!).
Now, that has the problem of possibly jumping values. alternatively just show wall clock time: Output(Math.floor(delta / 1000)) // in seconds Var delta = Date.now() - start // milliseconds elapsed since start Then base your logic on the current time value, instead of counting how often your callback has been executed.įor a simple timer or clock, keep track of the time difference explicitly: var start = Date.now() Use the Date object instead to get the (millisecond-)accurate, current time. They are allowed to lag arbitrarily, and they do not keep a constant pace but tend to drift (as you have observed).
They cannot be trusted, there are no accuracy guarantees for them. Because you are using setTimeout() or setInterval().
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