$el

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小牛编辑

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2023-12-01

描述 (Description)

它表示视图元素的cached jQuery object 。一个方便的引用，而不是一直重新包装DOM元素。

语法 (Syntax)

view.$el

例子 (Example)

<!DOCTYPE html>
<html>
   <head>
      <title>View Example</title>
      <script src = "https://code.jquery.com/jquery-2.1.3.min.js"
         type = "text/javascript"></script>
      <script src = "https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js" 
         type = "text/javascript"></script>
      <script src = "https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js"
         type = "text/javascript"></script>
   </head>
   <body>
      <div id = "myapp"></div>
      <script type = "text/javascript">
         //'ViewDemo' is a name of the view class
         var ViewDemo = Backbone.View.extend ({
            //'el' is a view reference in which every element of view associate with 
            //HTML content will be rendered
            el: '#myapp',
            //This function is called when the view is instantiated
            initialize: function() {
               this.render();  //render method specifies how to handle and what to display in the view
            },
            //'$el' is cached object which pushes the content defined within it
            render: function() {
               this.$el.html("Welcome to xnip!!!");
            }
         });
         //'myview' is a instance of the 'ViewDemo' class
         var myview = new ViewDemo();
      </script>
   </body>
</html>