$ ("#bankAccountNumber"). Change (function () {
Alert ("1"),
var account = $ (" ChannelForm.bankAccount.account "). Val ();
Alert ("2");
var reg =/^d{19}$/g//is preceded by a 19-digit number, ending with a 19-digit number
if (!reg.test)
{
Alert ("Malformed, should be a 19-digit number!"). ");
}
})
<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd
<meta http-equiv= "Content-type" Content= "text/html; charset=gb2312 "/>
<title> Verify bank account </title>
<style type=" Text/css "
<!--
. STYLE1 {color: #FF0000}
</style>
<script language= "javascript" type= "Text/javascript" >
function Check ()
{
var account = Document.form1.account.value
var reg =/^d{19}$/g;//begins with a 19-digit number ending with a 19-digit number
if (!reg.test (account)
{
Alert ("Malformed, should be 19 digits!") ");
}
Else
{
Alert ("Validation succeeded!"). ");
}
</script>
<body>
<form id= "Form1" Name= "Form1" method= "Post" action= ""
<p> Account:
<input type= " Text "name= account" id= "account"/>
<span class= "STYLE1" >* (19 digits) </span></p>
<p>
<input type= "button" name= "button" id= "button" value= "Verify" onclick= "Check ()"/>
</p
</form>
</body>
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