运用jQuery写的验证表单

//运用jQuery写的验证表单
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
    <script src="js/jquery-1.3.1.js"></script>
    <script src="js/lib/jquery.validate.js"></script>
    <script src="js/lib/jquery.validate.messages_cn.js"></script>
    <style>
        body {
            font: 12px/19px Arial, Helvetica, sans-serif;
            color: #666;
        }

        form div {
            margin: 5px 0;
        }

        .int label {
            float: left;
            width: 100px;
            text-align: right;
        }

        .int input {
            padding: 1px 1px;
            border: 1px solid #ccc;
            height: 16px;
        }

        .sub {
            padding-left: 100px;
        }

        .sub input {
            margin-right: 10px;
        }

        .formtips {
            width: 200px;
            margin: 2px;
            padding: 2px;
        }

        .onError {
            background: #FFE0E9 url(images/reg3.gif) no-repeat 0 center;
            padding-left: 25px;
        }

        .onSuccess {
            background: #E9FBEB url(images/reg4.gif) no-repeat 0 center;
            padding-left: 25px;
        }

        .high {
            color: red;
        }
    </style>
    <script>
        $(function () {
            $("form :input.required").each(function () {
                var $required = $("<strong class='high'>*</strong>");
                $(this).parent().append($required);
            })
            $("form :input").blur(function () {
                var $parent = $(this).parent();
                $(".formtips").remove();
                if ($(this).is("#username")) {
                    if (this.value == '' || this.value.length < 6) {
                        var errmsg = '请输入正确的格式.';
                        $parent.append('<span class="formtips onError">' + errmsg + '</span>')
                    } else {
                        var sucssemsg = '格式输入正确';
                        $parent.append('<span class="formtips onSuccess">' + sucssemsg + '</span>')
                    }
                }
                if ($(this).is("#email")) {
                    //邮箱格式正则表达式的用法
                    if (this.value == '' || ( this.value != "" && !/.+@.+.[a-zA-Z]{2,4}$/.test(this.value) )) {
                        var errmsg = '请输入正确的格式.';
                        $parent.append('<span class="formtips onError">' + errmsg + '</span>')
                    } else {
                        var sucssemsg = '格式输入正确';
                        $parent.append('<span class="formtips onSuccess">' + sucssemsg + '</span>')
                    }
                }
            })
            $("#send").click(function () {
                    var onerr = $(this).parent().siblings().children().hasClass("onError");//出错就会添加class为onerror的元素
                    if(onerr) {
                        return false;
                    } else {
                        alert("你已经注册成功了");
                    }
                }
            )
            $("#reset").click(function () {
                $(".formtips").remove();
            })
        })
    </script>
</head>
<body>

<form method="post" action="">
    <div class="int">
        <label for="username">用户名:</label>
        <input type="text" id="username" class="required"/>
    </div>
    <div class="int">
        <label for="email">邮箱:</label>
        <input type="text" id="email" class="required"/>
    </div>
    <div class="int">
        <label for="personinfo">个人资料:</label>
        <input type="text" id="personinfo"/>
    </div>
    <div class="sub">
        <input type="submit" value="提交" id="send"/><input type="reset" id="res"/>
    </div>
</form>

</body>
</html>