js 禁止f12、Ctrl +S 、右键

   <script language=javascript>
        window.onload=function(){
            document.onkeydown=function(){
                var e=window.event||arguments[0];
                if(e.keyCode==123){
                    return false;
                }else if(e.ctrlKey||e.keyCode==73){
                    return false;
                }
            };
            document.oncontextmenu=function(){
                return false;
            }
        }
    </script>