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  转载自：http://www.cnblogs.com/top5/archive/2012/03/24/2415993.html