document.onkeydown = () => {

  //禁用F12
  if (window.event && window.event.keyCode == 123) {
    return false;
  
  } else if (window.event.ctrlKey && window.event.shiftKey && window.event.keyCode == 73) {
    return false;
  
  } else if (window.event.shiftKey && window.event.keyCode == 121) {
    return false;
  }

};
// 禁用右键

document.oncontextmenu = new Function(“event.returnValue=false”);

转自:
https://blog.csdn.net/qq_41531604/article/details/129125204