Block F1 ~ Js functions for F12 shortcut keys

Copy codeThe Code is as follows:
Function window. onhelp () {return false} // block F1 help
/* KeyCod disabled the F2-F12 key from 113-123, 13 disabled the Enter key, 8 disabled the BackSpace key )*/

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 + "\ n please use the Del key to delete characters! ");
Window. event. returnValue = false;
}
If (window. event & window. event. keyCode = 505 ){
Alert (str)
Window. event. returnValue = false;
}
}