JS 屏蔽键盘不可用与鼠标右键不可用的方法

    <script language="javascript">
        function block() {
            event.keyCode = 0;
            event.returnvalue = false;
            alert("不可用.");
        }
        document.onkeypress = block;
    </script>

      <script language="javascript">
        function block(oEvent) {
            if (window.event) {
                oEvent = window.event;
            }

            if (oEvent.button == 2) {
                alert("鼠右不可用");

            }
        }
        document.onmousedown = block;
    </script>