ReferenceError: Backbone is not defined -试图使用Parse.com Javas

我正在尝试为一个学校项目建立一个网站，iOS应用程序和Android应用程序，这需要我有一个服务器。我决定使用Parse，因为它是免费的，我已经使用它的iOS应用程序。虽然，我没有Parse的Javascript SDK的经验。

问题:
我已经在我的index.html文件中链接了所有所需的库，但当我启动网站时，我得到以下错误:

ReferenceError: Backbone is not defined.

问题:
是什么导致了这个错误?我该怎么补救呢?

从我读到的SDK是建立在Backbone.js之上的，我必须有下划线。js链接，因为Backbone.js依赖于它?

index . html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, height=device-height, initial-scale=1">
    <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
    <title>TutorMe - Home</title>
    <!-- Bootstrap -->
    <link href="./bootstrap-3.3.5/css/bootstrap.min.css" rel="stylesheet">
    <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
    <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
    <!--[if lt IE 9]>
      <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
      <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
    <![endif]-->
  <link href="./css/index.css" rel="stylesheet">
  <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
  <script type="text/javascript" src="http://www.parsecdn.com/js/parse-1.5.0.min.js"></script>
</head>
<body>
  <script type="text/javascript" src="./app/models/database.js"></script>
  <!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"> </script>
  <!-- Include all compiled plugins (below), or include individual files as needed -->
  <script src="./bootstrap-3.3.5/js/bootstrap.min.js"></script>
</body>
</html>

database.js

  Parse.initialize("X", "X");
  var Student = Backbone.Model.extend({
  });
  var StudentList = Backbone.Collection.extend({
    model: Student
  });
  var StudentListController = Backbone.View.extend({
    initialize: function() {
    }
  });

编辑:

如果我链接backbone.js，我得到以下错误:

[Error] TypeError: undefined is not an object (evaluating 'i.extend')
    (anonymous function) (backbone-min.js, line 1)
[Error] ReferenceError: Can't find variable: Backbone
    global code (database.js, line 3)

代码:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.2.2/backbone-min.js"></script>

看起来您没有链接您的backbone.js文件

<script src="/path/to/backbone.js"></script>

或链接到cdn

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.2.2/backbone-min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.2.2/backbone-min.map"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.2.2/backbone.js"></script>

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