I am now doing a student online exam system, shall be the only choice, so I think when the exam will begin to make the browser as a full-screen state, and in order not to let the students use mobile storage equipment to cheat, I hope I can block all the keyboard keys (main in order not to let the student in the examination process of the cut screen out cheating), the hope can help me predecessors, if can't solve with code can also help me to provide a solution, thank you!!!!!!
