Disabled Reload Page (F5 / CTRL+R)

// bisa dikombinasikan dgn " window.open("ISI_URL_MU","mywindow","status=1,toolbar=0") " , agar tidak direfresh lewat button

document.onkeydown = function(e) {
var key;
if (window.event) {
key = event.keyCode
}
else {
var unicode = e.keyCode ? e.keyCode : e.charCode
key = unicode
}

switch (key) {//event.keyCode
case 116: //F5 button
key.returnValue = false;
key = 0; //event.keyCode = 0;
return false;
case 82: //R button
if (event.ctrlKey) {
key.returnValue = false;
key = 0; //event.keyCode = 0;
return false;
}
case 91: // ctrl + R Button
event.returnValue= false;
key=0;
return false;
}
}