Screen Orientation API

Screen Orientation API （屏幕方向）

Screen Orientation API: Managing Screen Orientation in Web Applications

The Screen Orientation API is a web technology that allows web developers to detect and control the orientation of a user’s device screen. It provides information about the current screen orientation (e.g., portrait or landscape) and allows developers to lock the screen orientation to a specific mode. In this article, we’ll explore what the Screen Orientation API is, its benefits, how it works, and how to use it in web applications based on information from Mozilla Developer Network.

What is the Screen Orientation API?

The Screen Orientation API provides web developers with the ability to access information about the orientation of a user’s device screen. It enables applications to adjust their layout and behavior based on the current orientation, providing a more responsive and user-friendly experience. （屏幕方向API使Web开发人员能够访问有关用户设备屏幕方向的信息。它使应用程序能够根据当前方向调整其布局和行为，提供更快的响应和用户友好的体验。）

Benefits of the Screen Orientation API

Responsive Layouts Web applications can adapt their layouts and content to provide a seamless experience in both portrait and landscape orientations. Enhanced User Experience By optimizing the layout for the current orientation, applications can ensure that content is displayed in the most user-friendly way possible. （响应式布局 Web应用程序可以调整其布局和内容，以提供纵向和横向的无缝体验。增强的用户体验通过优化当前方向的布局，应用程序可以确保以最用户友好的方式显示内容。） Locking Orientation Developers can lock the screen orientation to prevent unintended changes, ensuring that the app remains in the desired mode. Gaming and Multimedia The API is valuable for gaming and multimedia applications that may require specific screen orientations for optimal performance and user engagement. （锁定方向开发人员可以锁定屏幕方向，以防止意外更改，确保应用保持所需模式。游戏和多媒体 API对于可能需要特定屏幕方向才能获得最佳性能和用户参与度的游戏和多媒体应用程序非常有价值。）

How the Screen Orientation API Works

The Screen Orientation API provides access to the Screen object, which contains information about the current screen orientation. Here are some key components:

Screen.orientation Property The &aposScreen.orientation&apos property provides information about the current screen orientation. It returns an object with properties like &aposangle&apos, &apostype&apos, and &aposlock&apos. （1. Screen.orientation属性 & aposScreen.orientation&apos属性提供有关当前屏幕方向的信息。它返回具有& aposangle&apos、& apostype&apos和& aposlock&apos等属性的对象。）

&aposangle&apos: Indicates the rotation angle in degrees (0, 90, 180, or 270) of the screen. For example, 0 degrees represents portrait orientation.
&apostype&apos: Describes the type of orientation, such as “portrait-primary,” “landscape-secondary,” etc.
&aposlock&apos: Allows developers to lock the screen orientation to a specific mode, preventing automatic changes.

Locking Screen Orientation （2.锁屏方向）

To lock the screen orientation, developers can use the Screen.orientation.lock() method. For example, to lock the screen in landscape mode:

// Lock the screen in landscape mode
Screen.orientation.lock('landscape');

Using the Screen Orientation API

Here’s a basic example of how to use the Screen Orientation API to respond to screen orientation changes and lock the orientation:

// Detect screen orientation changes
window.addEventListener('orientationchange', () => {
 const currentOrientation = Screen.orientation.type;
 console.log('Current orientation:', currentOrientation);
});

// Lock the screen in landscape mode
Screen.orientation.lock('landscape');

In this code:

We use the orientationchange event to detect changes in screen orientation. （-我们使用方向更改事件来检测屏幕方向的变化。）
We retrieve and log the current screen orientation using Screen.orientation.type. （-我们使用Screen.orientation.type检索并记录当前屏幕方向。）
We lock the screen orientation to landscape mode using Screen.orientation.lock(). （-我们使用Screen.orientation.lock ()将屏幕方向锁定为横向模式。）

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Screen Orientation API