stack page

Before we integrate the history stack with the photo gallery application, we will build a simple page to test the functionality.

在把历史堆栈集成到相册应用程序之前，首先要建立一个简单的页面来测试其功能。

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Rather than building the history stack directly into the photo gallery, we generated a simple page to test our class.

我们没有直接在相册应用程序中建立历史堆栈，而是用一个简单的页面测试这个类。

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When adding the backward and forward button handlers, you will also see that this function is called to update the page from the event IDs we have been saving to the history stack.

添加后退和前进按钮处理程序时，还将调用该函数，根据保存到历史堆栈中的事件ID来更新页面。

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