#Js active timer debugging code
One important case to note is that the function or code snippet cannot be executed until The timeout can also fire later than expected if the page (or the OS/browser) is busy with other tasks. The throttling minimum delay is 10,000 ms, or 10 seconds, which comes into effect 30 seconds after a When running in the foreground, the throttling minimum delay is still 4ms. Firefox does not throttle inactive tabs if the tab contains an AudioContext.įirefox enforces additional throttling for scripts that it recognizes as tracking scripts. Advanced JavaScript Debugging with console.table () Advanced JavaScript Logging Using oup () JavaScript Promises in Depth ES2015 brought a native Promise implementation to the JavaScript standard library.
#Js active timer debugging for android
Firefox for Android has a minimum timeout of 15 minutes for inactive tabs and may unload them entirely.Firefox Desktop and Chrome both have a minimum timeout of 1 second for inactive tabs.The specifics of this are browser-dependent:
It may also be waived if a page is playing sound To reduce the load (and associated battery usage) from background tabs, browsers will enforceĪ minimum timeout delay in inactive tabs. log ( "this is the first message" ) }, 5000 ) setTimeout ( ( ) => Timeouts in inactive tabs param1, …, paramN OptionalĪdditional arguments which are passed through to the function specified byĬonsole. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself. Check out John Resig's blog post about the accuracy of JavaScript time to learn why. If you need to measure time precisely, neither Date.getTime() nor console.time() will get you far. Note that in either case, the actual delay may be longer than intended see Reasons for delays longer than specified below.Īlso note that if the value isn't a number, implicit type coercion is silently done on the value to convert it to a number - which can lead to unexpected and surprising results see Non-number delay values are silently coerced into numbers for an example. You can apply CSS to your Pen from any stylesheet on the web. Finally, here's IE 11, which only logs the duration if the console is open at that time: A Closing Word on High-Precision Timing. Is used, meaning execute "immediately", or more accurately, the next event cycle.
If this parameter is omitted, a value of 0 The specified function or code is executed. The time, in milliseconds that the timer should wait before Recommended for the same reasons that make using Which is compiled and executed when the timer expires. codeĪn alternative syntax that allows you to include a string instead of a function, A function to be executed after the timer expires.
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