Accessibility 类
🌐 Accessibility class
Accessibility 类提供了用于检查浏览器可访问性树的方法。可访问性树被辅助技术使用，例如屏幕阅读器或开关。
🌐 The Accessibility class provides methods for inspecting the browser's accessibility tree. The accessibility tree is used by assistive technology such as screen readers or switches.
语法
🌐 Signature
export declare class Accessibility
附注
🌐 Remarks
无障碍性是一个非常依赖平台的事情。在不同的平台上，可能有不同的屏幕阅读器，其输出可能差异很大。
🌐 Accessibility is a very platform-specific thing. On different platforms, there are different screen readers that might have wildly different output.
Blink——Chrome 的渲染引擎——有一个“可访问性树”的概念，然后将其转换为不同平台特定的 API。可访问性命名空间使用户能够访问 Blink 可访问性树。
🌐 Blink - Chrome's rendering engine - has a concept of "accessibility tree", which is then translated into different platform-specific APIs. Accessibility namespace gives users access to the Blink Accessibility Tree.
在从 Blink AX 树转换为特定平台的 AX 树或由辅助技术本身进行转换时，大部分可访问性树会被过滤掉。默认情况下，Puppeteer 会尝试近似这种过滤，只公开树中“有趣”的节点。
🌐 Most of the accessibility tree gets filtered out when converting from Blink AX Tree to Platform-specific AX-Tree or by assistive technologies themselves. By default, Puppeteer tries to approximate this filtering, exposing only the "interesting" nodes of the tree.
这个类的构造函数被标记为内部。第三方代码不应直接调用构造函数或创建继承 Accessibility 类的子类。
🌐 The constructor for this class is marked as internal. Third-party code should not call the constructor directly or create subclasses that extend the Accessibility class.
方法
🌐 Methods
方法 🌐 Method | 修饰符 🌐 Modifiers | 描述 🌐 Description |
|---|---|---|
| snapshot(options) | 捕获辅助功能树的当前状态。返回的对象表示页面的根辅助节点。 🌐 Captures the current state of the accessibility tree. The returned object represents the root accessible node of the page. 附注 注意 Chrome 可访问性树包含在大多数平台和大多数屏幕阅读器上未使用的节点。Puppeteer 也会丢弃它们，以便获得更易处理的树，除非将 |