<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
/* input:focus,textarea:focus{
border: 1px solid #f00;
background: #fcc
} */
.focus{
border: 1px solid #f00;
background: #fcc
}
</style>
</head>
<body>
<form action="#" method="POST" id="regForm">
<fieldset>
<legend>个人基本信息</legend>
<div>
<label for="username">名称：</label>
<input type="text" id="username">
</div>
<div>
<label for="pass">密码：</label>
<input type="password" id="pass">
</div>
<div>
<label for="msg">详细信息：</label>
<textarea id="msg"></textarea>
</div>
</fieldset>
</form>
</body>
<script type="text/javascript" src="js/jquery-3.2.1.js"></script>
<script type="text/javascript" src="js/jquery-1.7.2.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$(":input").focus(function(){
$(this).addClass('focus');
}).blur(function(){
$(this).removeClass('focus')
})
})
</script>
</html>
