js屏蔽右击

<script language="javascript">

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; //对ie5.0以上
// document.onmousedown = norightclick; //对其它浏览器火狐不支持
</script>