邮箱格式验证demo

<html>
<head>
<script type="text/javascript">
    function validate_email(field, alerttxt) {
        with (field) {
            apos = value.indexOf("@")
            dotpos = value.lastIndexOf(".")
            if (apos < 1 || dotpos - apos < 2) {
                alert(alerttxt);
                return false 
            }
            else {
                return true 
            }
        }
    }

    function validate_form(thisform) {
        with (thisform) {
            if (validate_email(email, "Not a valid e-mail address!") == false) {
                email.focus();
                return false
             }
        }
    }
</script>
</head>

<body>
<form action="submitpage.htm"onsubmit="return validate_form(this);" method="post">
Email: <input type="text" name="email" size="30">
<input type="submit" value="Submit"/> 
</form>
</body>
</html>

posted on 2016-07-11 13:21 小疯子li 阅读(573) 评论(0) 编辑收藏举报