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var now = new Date();
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var someDate = new Date(yyyy,mm,dd);
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var someDate = new Date(yyyy, mm, 0); //ÕâÑùÊǵÚmm¸öÔµÄ×îºóÒ»Ìì
var days = someDate.getDate();
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var s = document.getElementById("selectYear");
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var l = s.options.length;
for(var i=0;i<l;i++){
s.options.remove(0);
}
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<!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" />
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