<SCRIPT LANGUAGE="JavaScript">
<!--
function check_mail()
{
if(form1.email.value==""||form1.email.value.indexOf('@')=="-1"||form1.email.value.indexOf('.')=="-1")
{
alert("你没有输入或者是email地址不正确!");
form1.email.focus();
return false
}
}
//-->
</SCRIPT>
<form name=form1 onsubmit="return check_mail();">
<input type=text name=email>
<input type=submit>
</form>
<!--
function check_mail()
{
if(form1.email.value==""||form1.email.value.indexOf('@')=="-1"||form1.email.value.indexOf('.')=="-1")
{
alert("你没有输入或者是email地址不正确!");
form1.email.focus();
return false
}
}
//-->
</SCRIPT>
<form name=form1 onsubmit="return check_mail();">
<input type=text name=email>
<input type=submit>
</form>
<HTML>
<HEAD>
<SCRIPT LANGUAGE="JavaScript1.2">
function isEmailAddress (string) {
var addressPattern =
/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/;
return addressPattern.test(string);
}
function checkEmail (field) {
if (!isEmailAddress(field.value)) {
alert('Please enter correct email address!');
field.focus();
field.select();
}
}
</SCRIPT>
</HEAD>
<BODY>
<FORM NAME="aForm">
Your email address:
<INPUT TYPE="text" NAME="email"
ONCHANGE="checkEmail(this);"
>
</FORM>
</BODY>
</HTML>
{
if (umail.length == 0) return true;
var re=/^[\-!#\$%&'\*\+\\\.\/0-9=\?A-Z\^_`a-z{|}~]+@[\-!#\$%&'\*\+\\\.\/0-9=\?A-Z\^_`a-z{|}~]+(\.[\-!#\$%&'\*\+\\\.\/0-9=\?A-Z\^_`a-z{|}~]+)+$/;
if (re.test(umail))
return true;
return false;
}