问jQuery电子邮件验证在退格键上失败

EN

function validate_email() {
    atsplit = $('input[name=email]').val().split('@');
    dotsplit = atsplit[1].split('.');
    if (atsplit.length == 2 && atsplit[0].length > 0 && dotsplit[dotsplit.length-1].length > 0 && dotsplit[dotsplit.length-2].length > 0) {
        $('#email').html('✔');
        valid_email = true; 
    }
    else {
        $('#email').html('');
        valid_email = false;
    }
}
$('*').live('change click focusout keyup submit', function(){
    validate_email();
});