禁用 windows 按钮，用 javascript 替换大写

Question

I want to create application web "QUIZ ", In the application use the mouse only, I have disabled all keys except keys windows , alt ,'num lock' and caps button. I want Into application to disable the windows , alt and caps button with the following code but it doesn't work:

 document.onkeydown = function (e) { return false; } $(document).keydown(function (event) { // Prevent ALT - Prevent left window key - Prevent caps lock if (event.keyCode == 18 || event.keyCode == 91 || event.keyCode == 20) { console.log("clicked", event.keyCode); return false; } });

Answer 1

This is not possible. If it were, it would be a security concern. Websites can never modify standard browser or operating system behavior and it is a waste of time to try to do so, as bugs that allow it to be done will be fixed very quickly.