个性化阅读
专注于IT技术分析

backbone.js模型previousattributes

点击下载

Backbone.js PreviousAttributes模型返回上一次更改事件之前模型的先前属性。它用于获取模型版本之间的差异,或在发生错误后恢复先前的属性。

句法:

model.previousAttributes()

让我们举个例子。

请参阅以下示例:

<!DOCTYPE html>
   <head>
      <title>PreviousAttributes 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">
      var model = new Backbone.Model({
         jersey:10, player:'Dhoni', country:'India'
      });
      model.set('jersey', '99');
      document.write("All the attributes returned by the previousAttributes() method are: ");
      document.write("<br>");
      document.write(JSON.stringify(model.previousAttributes()));
   </script>
   </body>
</html>

输出:

将以上代码保存在previousattributes.html文件中,然后在新的浏览器中打开此文件。

赞(0)
未经允许不得转载:srcmini » backbone.js模型previousattributes

评论 抢沙发

评论前必须登录!