<html>
<head>
<script type="text/javascript" src="http://www.w3school.com.cn/jquery/jquery.js"></script>
<script type="text/javascript">
function getBirthdayFromIdCard(idCard) {
var birthday = "";
if(idCard != null && idCard != ""){
if(idCard.length == 15){
birthday = "19"+idCard.substr(6,6);
} else if(idCard.length == 18){
birthday = idCard.substr(6,8);
}
birthday = birthday.replace(/(.{4})(.{2})/,"$1-$2-");
}
return birthday;
}
console.log(getBirthdayFromIdCard("410183198607175317"));
</script>
</head>
<body>
</body>
</html>