EmberJS 对象模型替代调用

2018-01-03 17:13 更新

描述

在替代调用中,可以将一个或多个值传递给计算的属性,而不使用property()方法。这是可能的,因为Ember.js扩展了函数原型。

语句

ComputedPropertyName: Ember.computed('VarName1','VarName1','...','VarNamen', function(){
   return VarName;
})

例子

<!DOCTYPE html>
<html>
   <head>
      <title>Emberjs Alternate Invocation</title>
      <!-- CDN's -->
      <script src="https://cdnjs.cloudflare.com/ajax/libs/handlebars.js/3.0.1/handlebars.min.js"></script>
      <script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.10.0/ember.min.js"></script>
      <script src="https://builds.emberjs.com/tags/v1.10.0-beta.3/ember-template-compiler.js"></script>
      <script src="https://builds.emberjs.com/release/ember.debug.js"></script>
      <script src="https://builds.emberjs.com/beta/ember-data.js"></script>
   </head>
   <body>
      <script type="text/javascript">
         App = Ember.Application.create();

         App.Car = Ember.Object.extend({
            CarName: null,
            CarModel: null,
            CarYear: null,
            //defining the computed property function fullDetails
            fullDetails: Ember.computed('CarName', 'CarModel','CarYear', function(){
               return ' Car Name: '+this.get('CarName') + ' Car Model: ' + this.get('CarModel')+' Year: '+this.get('CarYear');
            })
         });

         var car_obj = App.Car.create({
            CarName: "Alto",
            CarModel: "800",
            CarYear: "2012",
         });
         //get the details of the 'fullDetails' computed property and display them
         document.write("Full details of the Car:<br>"+car_obj.get('fullDetails'));
      </script>
   </body>
</html>

输出

让我们执行以下步骤,看看上面的代码如何工作:

  • 将上面的代码保存在obj_mod_alt_invoc.html文件中

  • 在浏览器中打开此HTML文件。

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