还可以删除字段，修改标签或者改变字段绑定的数据节点。
You can also remove fields, change the labels, and change which data node the field is bound to.
不过应用程序缓存可不是你只要修改标签就可以搞定的。
The application cache isn't something that you can do by just changing your markup, though.
您将发现如果修改标签、加载不同的页面或修改地址栏中文本，每隔一秒就会输出不断增加的数字。
You should see increasing Numbers printed once a second if you change tabs, load a different page, or otherwise change the text in the location bar.
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