js禁止页面回退,刷新,右键代码(转)

//禁止页面回退
javascript: window.history.forward(1);

//禁止页面刷新
        document.onkeydown = function() {
        if ((event.keyCode == 116) || (event.ctrlKey && event.keyCode == 82))
            {
                event.keyCode = 0;
                event.returnValue = false;
            }
        }

//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;
}
}

//js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

//js屏蔽F5键刷新
<script> 
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; 
</script> 
--------------------------------------------------------------- 
<script language=javascript> 
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; 
      } 
} 
</script>