问题
Is it possible to check the status of Scroll Lock, Num Lock and Caps Lock on page load of a web page? I've found ways to check after a keypress using JavaScript, but that's not what I'm asking.
回答1:
No, you can't get system state from javascript. You will need them to type something and then analyze the input. Probably not what you wanted to hear =/
回答2:
IN 2019, this is now possible:
var x = event.getModifierState("ScrollLock"); Source: https://www.w3schools.com/jsref/event_mouse_getmodifierstate.asp
来源：https://stackoverflow.com/questions/9060073/check-scroll-lock-num-lock-caps-lock-in-javascript-on-page-load