F1-F12的禁用方法

document.onkeydown = function (e){e = window.event || e || e.which;                if (e.keyCode == 112 || e.keyCode == 113                    || e.keyCode == 114 || e.keyCode == 115                    || e.keyCode == 116 || e.keyCode == 117                    || e.keyCode == 118 || e.keyCode == 119                    || e.keyCode == 120 || e.keyCode == 121                    || e.keyCode == 122 || e.keyCode == 123) {                    e.keyCode = 0;                    return false;                }            });            // IE上F1上述方法会失败            window.onhelp = function () { return false };//