Javascript disables page refresh and decommission

[Javascript] & lt; scriptlanguage & quot; javascript & quot; & gt; // do not use the F5 key functiondocument. onkeydown () {if (event. keyCode116) {event. keyCode0; event. cancelBubbletrue; returnfa [javascript]

// Disable the F5 key
Function document. onkeydown ()
{
If (event. keyCode = 116)
{
Event. keyCode = 0;
Event. cancelBubble = true;
Return false;
}
}

// Disable context menu
Function document. oncontextmenu ()
{
Return false;
}

// The following Code enables full screen display
Function window. onload (){
Var Request = new Array (); // Save the Parameter
Var s = location. search. substring (1 );
If (s & s! = ""){
Var list = s. split ("&");
For (var I = 0; I <list. length; I ++ ){
Var pair = list [I]. split ("= ");
If (pair [0] & pair [0]! = ""){
Request [unescape (pair [0])] = unescape (pair [1]);
}
}
}

Var fullscreen = Request ["fullscreen"];
If (fullscreen! = "Yes "){
Var file = self. location;
Var a = window. open ("about: blank", "", "fullscreen = yes ")
Self. opener = null
Self. close ()
A. location = file + "? Fullscreen = yes ";
}
}
Script