js 屏蔽右键

<SCRIPT> 
function rf() 
{
  return false; 
} 
document.oncontextmenu = rf
 
function keydown() 
{
if(event.ctrlKey ==true || event.keyCode ==93 || event.shiftKey ==true)
{
return false;
} 
} 
document.onkeydown =keydown 
function drag() 
{
return false;
} 
document.ondragstart=drag 
function stopmouse(e) 
{ 
if (navigator.appName == 'Netscape' && (e.which == 3 || e.which == 2))
{ 
return false;
} 
else if 
(
navigator.appName == 'Microsoft Internet Explorer' && (event.button == 2 || event.button == 3))
{ 
return false; 
} 
return true; 
} 


document.onmousedown=stopmouse; 
if (document.layers) 
window.captureEvents(Event.MOUSEDOWN); 
window.onmousedown=stopmouse; 


</SCRIPT>