一、js屏蔽浏览器（IE和FireFox）的刷新功能 

document.οnkeydοwn=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