js屏蔽浏览器(IE和FireFox)的刷新和右键等功能

//一、js屏蔽浏览器(IE和FireFox)的刷新功能
document.onkeydown=function() {
  if ((window.event.keyCode==116)|| //屏蔽 F5
    (window.event.keyCode==122)|| //屏蔽 F11
    (window.event.shiftKey && window.event.keyCode==121) //shift+F10
   )

  {
    window.event.keyCode=0;
    window.event.returnValue=false;
  }
  if ((window.event.altKey)&&(window.event.keyCode==115)){ //屏蔽Alt+F4
    window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px");
    return false;
  }
}
二、屏蔽右键
if (window.Event)
  document.captureEvents(Event.MOUSEUP);
  function nocontextmenu(){
    event.cancelBubble = true
    event.returnValue = false;
    return false;
  }
function norightclick(e){
  if (window.Event){
    if (e.which == 2 || e.which == 3)
    return false;
  }
else
if (event.button == 2 || event.button == 3){
  event.cancelBubble = true
  event.returnValue = false;
  return false;
  }
}
  document.oncontextmenu = nocontextmenu; // for IE5+
  document.onmousedown = norightclick; // for all others
  document.oncontextmenu = function(){return false;} // 只用这一句达到效果

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