jquery 提示语淡入效果

<!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>
<title> jquery 提示语淡入</title>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<link rel="stylesheet" type="text/css" href="" />
<style type="text/css">
.tishi-com{display:none;width:65px;height:20px;line-height:20px; background:#fff9c9; border:1px solid #c7bf93; color:#666;
position:relative;left:230px;top:-22px;}
</style>
<script type="text/javascript" src="jquery-3.0.0.js"></script>
</head>

<body>
    <div style="width:500px;height:200px;border:1px solid #E5E5E5;margin:0 auto;">
        <div style="height:50px;width:100%;">
            <label class="user-label">用户名：</label>
            <input  type="text" class="username" name="username"/>
            <div class="tishi-com">
                <span class="tishi-font font-12"></span>
            </div>
        </div>

    <div style="height:50px;width:100%;">
        <label class="user-label">手机号：</label>
        <input  type="text" class="phone" name="phone"/>
        <div class="tishi-com">
            <span class="tishi-font font-12"></span>
        </div>
    </div>

        <div>
        <input type="submit" class="fade" value="提交" />
        </div>
    </div>

<script type="text/javascript">
    $(document).ready(function(){
        $(".fade").click(function(){
            var name=$.trim($(".username").val());
            var phone=$.trim($(".phone").val());
            if(name==""){
                $('input[name=username]').siblings('.tishi-com').fadeIn();
                $('input[name=username]').siblings('.tishi-com').find('.tishi-font').text('不能为空');
            }
            if(phone==""){
                $('input[name=phone]').siblings('.tishi-com').fadeIn();
                $('input[name=phone]').siblings('.tishi-com').find('.tishi-font').text('不能为空');
            }
        });
    });

</script>
</body>
</html>