js部分：;(function($){ //声明LightBox类构造函数
var LightBox = function(){
alert('msg');
};
LightBox.prototype = {
};
Window["LightBox"] = LightBox;
})(jQuery);html部分：<!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8">
<title>Document</title>
<link rel="stylesheet" type="text/css" href="css/reset.css">
<link rel="stylesheet" type="text/css" href="css/lightbox.css"> </head><body>
<script type="text/javascript" src="js/jquery-1.11.1.min.js"></script>
<script type="text/javascript" src="js/lightbox.js"></script>
<script type="text/javascript">
$(function(){ var LightBox = new LightBox();
}); </script></body></html>正常应该alert弹出框吧，但控制台如下错误是为什么？
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