BackboneJS — 檢視 $el

說明

它表示檢視元素的快取 jQuery 物件。這是一種方便的引用，可以隨時代替重新包裝 DOM 元素。

語法

view.$el

示例

即時演示

<!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 Tutorialspoint!!!");
            }
         });

         //'myview' is a instance of the 'ViewDemo' class
         var myview = new ViewDemo();
      </script>
      
   </body>
</html>

輸出

讓我們執行以下步驟來了解以上程式碼的工作原理 −

在dollar-el.htm檔案中儲存以上程式碼。
在瀏覽器中開啟這個 HTML 檔案。

backbonejs_view.htm

列印頁面