三个常用模式，切换简单；

Three commonly used modes, switch simple;

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为了提供一个在不同实现之间切换的简单方法，我们将提供一个接口和一个工厂。

In order to provide an easy way to switch between different implementations, we'll provide an interface and a factory.

youdao

因为可以使用CSS控制这两种布局，所以我们选用一种简单的样式切换技术。

Since we could control both layouts using CSS, we chose to use a simple style-switching technique.

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