$(this).val(e.data)中的data如何解释？？？
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<title></title>
<style>
.left div,
.right div {
width: 500px;
height: 50px;
padding: 5px;
margin: 5px;
float: left;
border: 1px solid #ccc;
}
.left div {
background: #bbffaa;
}
.right div {
background: yellow;
}
</style>
<script src="https://www.imooc.com/static/lib/jquery/1.9.1/jquery.js"></script>
</head>
<body>
<h2>.focusin()方法</h2>
<div class="left">
<div class="aaron">
点击聚焦：<input type="text" />
</div>
</div>
<div class="right">
<div class="aaron1">
点击聚焦并传递参数：<input type="text" />
</div>
</div>
<script type="text/javascript">
//input聚焦
//给input元素增加一个边框
$("input:first").focusin(function() {
$(this).css('border','2px solid red')
})
</script>
<script type="text/javascript">
//不同函数传递数据
$("input:last").focusin('慕课网', function fn(e) {
$(this).val(e.data)
});
</script>
</body>
</html>
