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jQuery效果之文本框失去焦点

2015-10-28 08:27 627 查看
<!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=gb2312" />

<title>无标题文档</title>

<link rel="stylesheet" type="text/css" href="style/hdw.css"/>

<script type="text/javascript" src="js/jquery-1.6.4.min.js"></script>

<script type="text/javascript">

$(document).ready(function(){





$(":input").focus(function(){



$(this).addClass("focusa");



if ($(this).val()==this.defaultValue){



$(this).val("");



}

}).blur(function(){



$(this).removeClass("focusa");





if ($(this).val()==""){



$(this).val(this.defaultValue);





}



});



});

</script>

</head>

<body>

<form action="" method="post">

<fieldset>

<legend>个人信息</legend>

<div>

<label for="username">姓名:</label>

<input type="text" id="username" value="小王" />

</div>

<div>

<label for="pass">密码:</label>

<input type="password" id="pass" value="123" />

</div>

<div>

<label for="hdw">内容:</label>

<textarea id="hdw">内容</textarea>

</div>

</fieldset>

</form>

</body>

</html>

CSS

/* CSS Document */

* { padding:0; margin:0;}

body { font-size:12px; font-family:"宋体";}

form { width:500px; position:absolute; top:50%; left:50%; margin:-70px 0 0 -250px;}

fieldset { border:2px solid green; padding:10px;}

legend { font-size:13px; font-weight:bold; padding:10px; color:green;}

div { padding:5px 0;}

label { color:green;}

input { height:25px; border:1px solid #C9C9C9; width:200px; font-size:12px; font-family:"宋体"; padding:0 5px; line-height:25px;}

textarea { width:200px; height:100px; border:1px solid green; font-size:12px; font-family:"宋体"; padding:5px; vertical-align:middle;}

.focusa { border:1px solid green; background:#FFF0FF;}
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