BackboneJS事件on

它结合一个事件到对象和回调函数。每当一个事件被触发,它执行回调。

语法

object.on(event, callback function, [context])

参数:

  • event: 它绑定对象
  • callback: 它是参考代码
  • context: 它是一个可以被传递到一个回调函数对象

例子

<!DOCTYPE html>
   <head>
      <title>Event On 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>
      <script type="text/javascript">
      	//Here creating an object 'myVal' and extending with Backbone.Events method
         var myVal = _.extend({name:'e-learn!!!'}, Backbone.Events);

         // The on() method will bind callback function to an object and invoked whenever an event triggers
         myVal.on('myFunc', function () {
            document.write("The triggered value is: ");
            document.write(this.name);//The name will get display by referring the current object
         });
         //It triggers the 'myFunc' event on object 'myVal'
         myVal.trigger('myFunc');
      </script>
   </body>
</html>

输出

让我们进行以下步骤来看看上面的代码工作:

  • 保存上述代码在文件 on.html 中

  • 在浏览器中打开这个HTML文件