Shared Storage

Shared Storage is a concept in web development that refers to a proposed API allowing websites to share storage between different contexts, such as different iframes or workers, within the same origin. This feature enables more efficient data sharing and coordination within the same application, improving performance and reducing redundancy.

共享存储是在Web开发中的一个概念，它指的是一个允许网站在同一源中的不同上下文（如不同的iframe或worker）之间共享存储的提议API。这个特性可以在同一应用程序中实现更高效的数据共享和协调，提高性能并减少冗余。

Here’s how Shared Storage can be conceptualized:

以下是如何概念化共享存储：

1. Single Origin Storage: Shared Storage allows different components of a web application (like iframes or workers) that share the same origin to access a common storage area.

   单一源存储: 共享存储允许共享相同源的Web应用程序的不同组件（如iframe或worker）访问公共存储区。

2. Efficient Data Sharing: It enables efficient sharing of data between these components, which is particularly useful in complex web applications that need to maintain consistency across various contexts.

   高效的数据共享: 它可以在这些组件之间实现高效的数据共享，这对于需要在各种上下文中保持一致性的复杂Web应用程序特别有用。

3. Coordination Between Contexts: Shared Storage allows better coordination between different parts of a web application, reducing the need for repetitive data fetching or duplication.

   上下文之间的协调: 共享存储允许Web应用程序的不同部分之间进行更好的协调，减少了重复数据获取或数据重复的需要。

Here’s a hypothetical example of how Shared Storage might be implemented:

以下是共享存储可能实现的一个假设示例：

1. Main application iframe initializes shared storage.
2. Worker thread accesses the shared storage to retrieve configuration data.
3. Another iframe updates the shared storage with new user preferences.
4. All contexts (main iframe, worker, and other iframes) reflect the updated data without redundant requests.

1. 主应用程序iframe初始化共享存储。
2. worker线程访问共享存储以检索配置数据。
3. 另一个iframe更新共享存储中的新用户偏好。
4. 所有上下文（主iframe、worker和其他iframe）反映更新的数据，而无需冗余请求。

The comparison of Shared Storage with other storage methods is shown in the table below:

共享存储与其他存储方法的比较如下表所示：

Shared Storage is very useful for improving data consistency and efficiency in complex web applications that involve multiple contexts within the same origin.

共享存储在涉及同一源中多个上下文的复杂Web应用程序中非常有用，它可以提高数据一致性和效率。

以下是关于共享存储的5个面试问题及其答案

1. What is Shared Storage, and how does it benefit web applications?

什么是共享存储，它对Web应用程序有何好处？

Shared Storage is a proposed API that allows data sharing between different contexts within the same origin, improving efficiency and coordination in web applications.

共享存储是一个允许在同一源的不同上下文之间共享数据的提议API，能够提高Web应用程序中的效率和协调性。

2. How does Shared Storage differ from local and session storage?

共享存储与本地存储和会话存储有何不同？

Shared Storage allows sharing data between different contexts (like iframes or workers) within the same origin, while local and session storage are more isolated and context-specific.

共享存储允许在同一源的不同上下文（如iframe或worker）之间共享数据，而本地存储和会话存储则更为隔离和特定于上下文。

3. In what scenarios would you use Shared Storage?

在什么场景下会使用共享存储？

Shared Storage is ideal for complex web applications that require consistent data across multiple contexts, such as iframes, workers, or different parts of a single-page application.

共享存储非常适合需要在多个上下文（如iframe、worker或单页应用程序的不同部分）中保持一致数据的复杂Web应用程序。

4. How does Shared Storage improve efficiency in web applications?

共享存储如何提高Web应用程序的效率？

Shared Storage reduces the need for redundant data fetching and duplication, allowing different contexts to access and update a common storage area efficiently.

共享存储减少了冗余数据获取和数据重复的需求，使不同的上下文能够高效地访问和更新公共存储区。

5. How would you coordinate data sharing between iframes using Shared Storage?

如何使用共享存储在iframe之间协调数据共享？

You can coordinate data sharing by initializing Shared Storage in the main iframe, then allowing other iframes to access and update the shared data as needed.

可以通过在主iframe中初始化共享存储，然后允许其他iframe根据需要访问和更新共享数据来协调数据共享。

Recommended Resources:

1. W3C: Shared Storage API
2. MDN Web Docs: Web Storage