isNew

优质

小牛编辑

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2023-12-01

描述 (Description)

如果模型未保存到服务器并且还没有id，则认为它是新的。此方法有助于确定此状态。

语法 (Syntax)

model.isNew()

例子 (Example)

<!DOCTYPE html>
   <head>
      <title> Model 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>
      <script type = "text/javascript">
         var Person = Backbone.Model.extend({
            defaults: {
               title: 'xnip'
            }
         });
         var person = new Person();
         document.write(person.isNew());
      </script>
   </head>
   <body></body>
</html>