undefined is not a function error in backbone

I have a html template which includes backbone code.i am a newbiw to backbone.whenever i try to run the code it shows an uncaught error undefined is not a function error.Please help.

  <!DOCTYPE html>
        <meta charset="utf-8">
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js"></script>
        <script src="http://ajax.cdnjs.com/ajax/libs/json2/20110223/json2.js"></script>
        <script src="http://ajax.cdnjs.com/ajax/libs/underscore.js/1.1.6/underscore-min.js"></script>
        <script src="http://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.0/backbone-min.js"></script>

        <script type="text/javascript">
        //ListView class: Our main app view.

      var ListView = Backbone.View.extend({
        el: $('body'), // attaches `this.el` to an existing element.

    //initialize(): Automatically called upon instantiation. Where you make all types of bindings, excluding UI events, such as clicks, etc.

        initialize: function(){
          _.bindAll(this, 'render'); // fixes loss of context for 'this' within methods

           this.render(); // not all views are self-rendering. This one is.

    //render(): Function in charge of rendering the entire view in this.el. Needs to be manually called by the user.

        render: function(){
          $(this.el).append("<ul> <li>hello world</li> </ul>");

    //listView instance: Instantiate main app view.

      var listView = new ListView();


The problem is caused by an old versions of underscore.js. After changing it to a newer version the error is gone and your code works.


Underscore version used in demo:


P.S. you can see the files imported (in HEAD), if you look at the External Resources in the left accordion menu on jsFiddle.

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