jQuery
$(function () {
$(document).keydown(function (e) {
return (e.which || e.keyCode) != 116;
});
});
Javascript
window.onload = function () {
document.onkeydown = function (e) {
return (e.which || e.keyCode) != 116;
};
}
chèn ở body html
onkeydown="return (event.keyCode != 116)"