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s = "2001/1/11"
alert(fmtDate(s))
function fmtDate(s){
s = s.replace(/-/g, "/");
var dt = new Date(s);
var m = dt.getMonth()+1;
var d = dt.getDate();
m = m<10?"0"+m:m;
d = d<10?"0"+d:d;
return dt.getFullYear() + m + d
}
s = "yyyy/mm/dd"
alert(s.replace(/\//g, "").substr(0, 6))
<html>
<head>
</head>
<body>
<script>
var s="yyyy/mm/dd";
alert(s.replace(/\//g,""));
</script>
</body>
</html>