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<input type="button" value="xxxxxxxxxxxxxxxx" id="butt" /><br />
<div id="text"></div>
<script type="text/javascript">
var butt = document.getElementById("butt");
var time;
butt.onmouseover = function () {
time = (new Date()).getTime();
}
butt.onmouseout = function () {
var t = (new Date()).getTime() - time;
document.getElementById("text").innerHTML = "悬停在按钮上的时间"+(t/1000).toFixed(2)+"秒";
}
</script>