问题
Javascript performance on mobile Safari (iPad) is much more sensitive for my application that it is on the desktop. Some operations that work super-smooth on the desktop take a while on the iPad, and I'd like to track down where the bottlenecks are. Is there some way to profile Javascript code on the iPad?
回答1:
If you have access to an Android phone, you can profile your application using desktop Chrome's developer tools and a USB cable (very convenient).
Android and iPhone behave+perform similarly, but not identically. That said, for 90% of use cases, if you improve performance on Android, you'll see the same improvements on iPhone.
Hour for hour, at least for the first pass of profiling, I think you'll get better results on iPhone using chrome+android to profile than using a less rich toolset.
https://developers.google.com/chrome/mobile/docs/debugging
It'll require Chrome, an Android device able to run the android Chrome app, and a USB cable.
You have to install and use the ADB console command, but once its working, you'll have the full chrome developer tools interface available for debugging mobile.
回答2:
You could try using a javascript profiling library (using timers for example) by a bit of searching I've found http://remysharp.com/2007/04/20/performance-profiling-javascript/ but since I didn't test it I can't tell you if its any good. You could place timers at various locations in your code and try to track down the bottlenecks that way.
(Js Microtime Library http://phpjs.org/functions/microtime:472)
来源：https://stackoverflow.com/questions/5384575/profile-mobile-safari-ipad-javascript