How to distinguish between users closing tabs and closing entire browsers using JavaScript?

JavaScript cannot directly detect whether the user has closed the tab page or the entire browser. Many developers face this problem when building applications. This article discusses how to realize the function of clearing login information only when the user closes the browser, while retaining the login information when closing a single tab in the Windows system Chrome browser.

The key to the solution is to utilize sessionStorage . sessionStorage is a session-level storage that is automatically cleared when the browser is closed. Closed tabs will not affect the sessionStorage data of other tabs.

The specific implementation steps are as follows:

1. Use sessionStorage to store login information: After logging in successfully, store user information in sessionStorage , not localStorage .

    //Storage login information when logging in sessionStorage.setItem('userLoginInfo', JSON.stringify(userData));

2. Automatically clear the browser when the browser is closed: no additional code is required. When the browser is closed, the data in sessionStorage will be automatically cleared.

3. Close the tab page and keep logged in: Close one tab page, the sessionStorage data of other tab pages will not be affected, and the user remains logged in in other tab pages.

This method utilizes the browser's session management mechanism. Although different browsers may differ slightly, it can effectively implement the expected functions in most modern browsers. It should be noted that this is not a perfect solution, as in some cases, the browser may be closed abnormally, causing sessionStorage data to fail to be completely cleared. For applications with extremely high security requirements, it is recommended to combine other more reliable mechanisms to manage login status.

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