Uncaught RangeError: Maximum call stack size exceeded？what?
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>团购——限时抢</title>
<link rel="stylesheet" href="style.css" />
</head>
<body>
<div class="content3">
<div class="time">还剩 <span id="LeftTime"></span></div>
</div>
<script>
window.onload = function() {
ftime();
}
function ftime() {
var endtime = new Date('2016/07/09,12:20:12');
var nowtime = new Date();
var lefttime = parseInt((endtime.getTime() - nowtime.getTime()) / 1000);
//alert(lefttime);
d = parseInt(lefttime / 3600 / 24);
h = parseInt((lefttime / 3600) % 24);
m = parseInt((lefttime / 60) % 60);
s = parseInt(lefttime % 60);
document.getElementById("LeftTime").innerHTML = d + "天" + h + "小时" + m + "分" + s + "秒";
if (lefttime <= 0) {
document.getElementById("LeftTime").innerHTML = "团购已结束";
clearInterval(sh);
}
var sh;
sh=setTimeout(ftime(),500);
}
</script>
</body>
</html>如题，第二十行。。。
