The JS function _javascript technique of the shortcut key of shielding F1~f12

Copy Code code as follows:

function Window.onhelp () {return false}//Shield F1 Help
/*keycod from 113-123 respectively disabled f2-f12 key, 13 disabled Enter, 8 disabled backspace (BackSpace) * *

Document.onkeydown = function () {
if (window.event && Window.event.keyCode = 113) {
Window.event.keyCode = 505;
}
if (window.event && window.event.keyCode = 114) {
Window.event.keyCode = 505;
}
if (window.event && window.event.keyCode = 115) {
Window.event.keyCode = 505;
}
if (window.event && window.event.keyCode = 116) {
Window.event.keyCode = 505;
}
if (window.event && Window.event.keyCode = 117) {
Window.event.keyCode = 505;
}
if (window.event && Window.event.keyCode = 118) {
Window.event.keyCode = 505;
}
if (window.event && Window.event.keyCode = 119) {
Window.event.keyCode = 505;
}
if (window.event && window.event.keyCode = 120) {
Window.event.keyCode = 505;
}
if (window.event && window.event.keyCode = 121) {
Window.event.keyCode = 505;
}
if (window.event && window.event.keyCode = 122) {
Window.event.keyCode = 505;
}
if (window.event && Window.event.keyCode = 123) {
Window.event.keyCode = 505;
}
if (window.event && window.event.keyCode = 13) {
Window.event.keyCode = 505;
}
if (window.event && Window.event.keyCode = 8) {
Alert (str+ "\ nplease use the DEL key to delete the characters!") ");
Window.event.returnvalue=false;
}
if (window.event && window.event.keyCode = 505) {
Alert (str)
Window.event.returnvalue=false;
}
}