js屏蔽F5 兼容ie和firefox
<script type="text/javascript">
//禁止用F5键(兼容IE和Firefox)
var check = function(e) {
e = e || window.event;
if ((e.which || e.keyCode) == 116 || (e.ctrlKey && (e.which || e.keyCode) == 82)) {
if (e.preventDefault) {
e.preventDefault();
}
else {
event.keyCode = 0;
e.returnValue = false;
}
}
}
if (document.addEventListener) {
document.addEventListener("keydown", check, false);
}
else {
document.attachEvent("onkeydown", check);
}
</script>