How to use JavaScript to implement the back function

JavaScript is a scripting language commonly used in web application and website development. In this process, user interface features are crucial, one of which is the functionality of the "back" button. The history object is provided in HTML5, which can easily implement the back and forward functions. This article will introduce how to implement the back function using JavaScript.

1. Use history.back()

The history.back() method is used to navigate to the previous record in the user's access history. For example, when users use the search function, they may click on a few links and then want to return to the previous page to make changes. In this case, you can use the history.back() method.

Use as follows:

history.back();

This will return to the previous page. If the page the user originally visited was a search results page, the page before the search will be returned. This is because the history object stores the user's access history.

2. Use history.go()

The history.go() method can also be used to navigate to the previous page, but the difference from history.back() is that you can specify How many records to return. For example, if the user wants to return to the third page they viewed previously, they can use the following code:

history.go(-2);

This will return the third most recent page. If a user attempts to return to three pages while visiting fewer than three pages, the oldest record will be returned.

3. Use window.location.href

Another method is to use the location object to return to the previous page. Use the window.location.href property to get the URL of the current page and then redirect it to the URL of the previous page. A code example of this method is as follows:

window.location.href = document.referrer;

Use the document.referrer property to get the URL of the previous page, and then redirect window.location.href to the previous page.

Summary

The above three methods can help you implement the functionality of the "Back" button in JavaScript applications and websites. Use any of these methods to easily return to the user's history and improve the user experience.

However, it is important to note that if your website or application uses a single page application (SPA) architecture, you may need to use the router function of the front-end framework to implement the back and forward functionality, such as Vue Router or React Router. This is because in SPA, page switching is managed through the front-end router, not through the browser history.

When implementing a Back button, keep the user experience in mind and make sure the implementation method meets the needs of your app or website.

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