js禁止页面回退,刷新,右键代码

  //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>