帮我找一找错误
<!DOCTYPE html>
<html>
<head>
<title>编程挑战</title>
<link href="style.css" rel="stylesheet" type="text/css" />
<script src="http://www.imooc.com/data/jquery-1.8.2.min.js" type="text/javascript"></script>
</head>
<body>
<ul>
<li>one</li>
<li>two</li>
<li>three</li>
<li>four</li>
<li>five</li>
</ul>
<script type="text/javascript">
$(function($){
$.extends({
"focusout":function(){
$("li").bind("mouseover",function(){
$("li").css("brackground-color","#ccc");
});
$("li").bind("mouseout",function(){
$("li").css("brackground-color","#fff");
});
}
});
})(jQuery);
$(function(){
$.focusout();
});
</script>
</body>
</html>
