<!doctype>
<html>
<head>
<script type="text/javascript">
function dealCard(){
var birthday=getBirthday();
switch(birthday){
case 0:alert("Sorry,the program runs wrong!");break;
case 1:alert("You must be input again!");break;
default: alert("the birthday is"+birthday);break;
}
}
function getBirthday(){
var a=document.getElementById("card").value;
if(15==a.length || 18==a.length){
var left=a.length-12;
var right=a.length-4;
var b=a.slice(left,right);
if(8==b.length){
return b;
}
else return 0;
}
else return 1;
}
</script>
</head>
<body>
input <input type="text" id="card" height=20px width=40px/>
<br/>
<button type="button" onclick="dealCard()">please click it</button>
</body>
</html>
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