javascript 屏蔽F5，BackSpace，IE的刷新，右键功能

function DisableF5(){ 
   with (event){ 
           // F5 and Ctrl+R 
     if (keyCode==116 || (ctrlKey && keyCode==82)){ 
       event.keyCode = 0; 
       event.cancelBubble = true; 
       return false; 
     } 
   } 
} 

document.onkeydown = DisableF5; 

function document.onkeydown() 
{ 
   if ((event.keyCode==8)   ||                  //屏蔽退格删除键 
       (event.keyCode==116)||                  //屏蔽 F5 刷新键 
       (event.ctrlKey && event.keyCode==82)){ //Ctrl + R 
      event.keyCode=0; 
      event.returnValue=false; 
      } 
} 
 

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，js屏蔽浏览器右键功能

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