EmberJS 對象模型替代調(diào)用

2018-01-03 17:13 更新

描述

在替代調(diào)用中,可以將一個或多個值傳遞給計算的屬性,而不使用property()方法。這是可能的,因為Ember.js擴(kuò)展了函數(shù)原型。

語句

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>

輸出

讓我們執(zhí)行以下步驟,看看上面的代碼如何工作:

  • 將上面的代碼保存在obj_mod_alt_invoc.html文件中

  • 在瀏覽器中打開此HTML文件。

以上內(nèi)容是否對您有幫助:
在線筆記
App下載
App下載

掃描二維碼

下載編程獅App

公眾號
微信公眾號

編程獅公眾號