要让导航按钮工作，您需要马上实现Page IndexChange命令。

For the navigation buttons to work, you'll need to implement the PageIndexChange command in a moment.

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在任何危险情况下，只要按下按钮，训练有素的工作人员就会提供你所需要的帮助。

In any unsafe situation, simply press the button and a highly-trained agent will get you the help you need.

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基本规则是：如果允许别人单击链接，就必须在浏览器历史中增加一个对象，以便后退按钮能够正常工作。

The basic rule is: if you allow someone to click on a link, you have to add an object to the browser history so the Back button will work as expected.

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