<script language=JavaScript>
function checkform()
{
var strIdentityID
strIdentityID=document.input.IdentityID.value
if(isNaN(strIdentityID))
{
alert("身份证号必须由数字组成!");
document.input.IdentityID.focus();
return false;
}
if(strIdentityID.length<15)
{
alert("身份证号位数不足15位!");
document.input.IdentityID.focus();
return false;
}
if(strIdentityID.length>15&&strIdentityID.length<18)
{
alert("身份证号位数大于15位但不足18位!");
document.input.IdentityID.focus();
return false;
}
if(strIdentityID.length>18)
{
alert("身份证号位数超过18位!");
document.input.IdentityID.focus();
return false;
}
return true;
}
</script>
function checkform()
{
var strIdentityID
strIdentityID=document.input.IdentityID.value
if(isNaN(strIdentityID))
{
alert("身份证号必须由数字组成!");
document.input.IdentityID.focus();
return false;
}
if(strIdentityID.length<15)
{
alert("身份证号位数不足15位!");
document.input.IdentityID.focus();
return false;
}
if(strIdentityID.length>15&&strIdentityID.length<18)
{
alert("身份证号位数大于15位但不足18位!");
document.input.IdentityID.focus();
return false;
}
if(strIdentityID.length>18)
{
alert("身份证号位数超过18位!");
document.input.IdentityID.focus();
return false;
}
return true;
}
</script>
<head>
<script language="javascript">
function checkform()
{
var card
card=document.myform.idcard.value.length;
if(card!=15 && card!=18)
{
alert("你输入的身份证号码不足15位或18位"); }
}</script>
</head>
<body>
<form name="myform">
<input type="text" name="idcard" maxlength="18" onblur="checkform()">
</form>
</body>
</html>
function checkIdCard(num){
if (isNaN(num)) {alert("输入的不是数字!"); return false;}
var len = num.length, re;
if (len == 15){
re = new RegExp(/^(\d{6})()?(\d{2})(\d{2})(\d{2})(\d{3})$/);
}else if (len == 18){
re = new RegExp(/^(\d{6})()?(\d{4})(\d{2})(\d{2})(\d{3})(\d)$/);
}else {
alert("输入的数字位数不对!");
return false;
}
var a = num.match(re);
if (a != null) {
if (len==15) {
var D = new Date("19"+a[3]+"/"+a[4]+"/"+a[5]);
var B = D.getYear()==a[3]&&(D.getMonth()+1)==a[4]&&D.getDate()==a[5];
}else {
var D = new Date(a[3]+"/"+a[4]+"/"+a[5]);
var B = D.getFullYear()==a[3]&&(D.getMonth()+1)==a[4]&&D.getDate()==a[5];
}
if (!B) {alert("输入的身份证号 "+ a[0] +" 里出生日期不对!"); return false;}
}
return true;
}