问题
I have a JavaScript application, which works fine, but certainly needs some memory / CPU performance (it is based on top of Google maps).
So basically it runs fine on a Desktop / Laptop PC, iPad works OK. But with all these different devices nowadays, smaller devices are definitely overloaded.
So basically I want to determine the available runtime and decide whether I start my JavaScript application, or display a message instead.
- OK, I could check the browser, but this is a never ending story
- I could check on the OS information, but again this is very tedious. Also some OS run on high performance devices as well as low end hardware.
- I could check on the screen size and rule out mobile phones, but then it gets difficult
So is there a way to determine the performance of the client? Just to make it clear, I do not care whether it is a tablet for instance, but if it is a low performance tablet with little CPU performance / memory (so Detect phone/tablet/web client using javascript does not help).
回答1:
In javascript You could check list of features and based on that do conclusion if device is low memory.
For example:
Check core count with window.navigator.hardwareConcurrency (For better coverage add Core Estimator polyfill)
Check WebGL support (I like user2070775 suggestion): Proper way to detect WebGL support?
Check if its desktop or mobile. Most likely desktop will not have any problems with memory.
Check resolution of screen - most likely small resolution will be on low memory devices.
来源：https://stackoverflow.com/questions/15260403/javascript-how-to-determine-performance-of-the-runtime-aka-browser