HTML：
<!DOCTYPE >
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style type="text/css">
* {
/*margin: 0px;
padding: 0;*/
font-family: "微软雅黑", "arial", " sans-serif";
font-size: 16px;
}
body {
margin: 20px;
}
.focus {
border: 1px solid #f00;
background: #fcc;
}
</style>
<script type="text/javascript" src="js/jquery-2.2.2.min.js">
</script>
<script type="text/javascript">
$(function () {
$(":input")
.focus(function () {
$(this).addClass("focus");
})
.blur(function () {
$(this).removeClass("focus");
})
});
</script>
</head>
<body>
<form>
<fieldset style=" 370px;height: 136px;">
<legend>登录界面</legend>
<div>
<label for="username">用户：</label>
<input id="username" type="text"/>
</div>
<div>
<label for="pass">密码：</label>
<input id="pass" type="password"/>
</div>
</fieldset>
</form>
</body>
</html>
result：
运行：
HTML：
<!DOCTYPE >
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style type="text/css">
* {
/*margin: 0px;
padding: 0;*/
font-family: "微软雅黑", "arial", " sans-serif";
font-size: 16px;
}
body {
margin: 20px;
}
.focus {
border: 1px solid #f00;
background: #fcc;
}
</style>
<script type="text/javascript" src="js/jquery-2.2.2.min.js">
</script>
<script type="text/javascript">
$(function () {
$(":input").bind({
focus: function () {
$(this).addClass("focus");
},
blur: function () {
$(this).removeClass("focus");
}
})
});
</script>
</head>
<body>
<form>
<fieldset style=" 370px;height: 136px;">
<legend>登录界面</legend>
<div>
<label for="username">用户：</label>
<input id="username" type="text"/>
</div>
<div>
<label for="pass">密码：</label>
<input id="pass" type="password"/>
</div>
</fieldset>
</form>
</body>
</html>