键盘监视,可以参考。。
<script type="text/javascript">
(function () {
var data = {};
document.onkeydown = function () {
var e = window.event || arguments[0], k = e.keyCode || e.which;
if (!data[k]) {
data[k] = k;
document.body.innerHTML += k + ":按下了<br \/>";
}
};
document.onkeyup = function () {
var i, e = window.event || arguments[0], k = e.keyCode || e.which;
delete data[k];
document.body.innerHTML += k + ":离开了<br \/>";
};
})();
</script>