window.onbeforeunload = function() {
return " ";
}
document.onkeydown = function() {
if ((window.event.keyCode == 116)
|| //屏蔽 F5
(window.event.keyCode == 122) || //屏蔽
F11
(window.event.shiftKey && window.event.keyCode == 121)
//shift+F10
) {
window.event.keyCode =
0;
window.event.returnValue = false;
}
if ((window.event.altKey)
&& (window.event.keyCode == 115)) {
//屏蔽Alt+F4
window.showModelessDialog("about:blank", "",
"dialogWidth:1px;dialogheight:1px");
return false;
}
}