屏蔽網頁上的滑鼠和快速鍵

// 屏蔽滑鼠右鍵菜單
document.oncontextmenu  = function () {event.returnValue=false;}

// 屏蔽掉其他與程式無關的鍵
document.onkeydown = function () {
                                            //8 退格鍵
                                            //78 Ctrl+N
                                            //37 Alt+ 方向鍵 ←
                                            //39 Alt+ 方向鍵 →
                                            //116 F5 重新整理鍵
                                            //82 Ctrl + R
                                            //121 shift+F10
                                            //115 屏蔽Alt+F4
                                            //屏蔽 shift 加滑鼠左鍵新開一網頁
                                            if (window.event.keyCode==8
                                                || event.keyCode==78
                                                || event.keyCode==37
                                                || event.keyCode==39
                                                || event.keyCode==82
//                                                || event.keyCode==112     // F1
                                                || event.keyCode==113     // F2
                                                || event.keyCode==114     // F3
                                                || event.keyCode==115     // F4
                                                || event.keyCode==116     // F5
                                                || event.keyCode==117     // F6
                                                || event.keyCode==118     // F7
                                                || event.keyCode==119     // F8
                                                || event.keyCode==120     // F9
                                                || event.keyCode==121     // F10
                                                || event.keyCode==122     // F11
                                                || event.keyCode==123     // F12
                                                || (window.event.srcElement.tagName == "A" && window.event.shiftKey))
                                            {
                                                event.keyCode     = 0;
                                                event.returnValue = false;
                                            }
                                      }