What is the javascript back method

JavaScript fallback method

JavaScript is an object- and event-driven scripting language that is commonly used for web client script programming. In web development, we often need to use JavaScript to interact with users and implement specific functions, one of which is the back method. The back method means that when the user clicks the "back" button on the current page, the browser automatically returns to the previous page. Let's learn how to implement the back method using JavaScript.

1. The window.history.back() method

The window.history.back() method is one of the most commonly used methods for JavaScript to go back. This method allows the web page to jump to the previous history record, that is, navigate backwards. The following is the syntax of this method:

window.history.back();

When this method is called, the browser will return to the last page visited. If this method is called on the first history page, it will have no effect because the browser has no more history to go back to.

2. History.go() method

The history.go() method can also implement JavaScript’s back function. This method enables forward or backward navigation of a web page. Here is the syntax for this method:

history.go(-1);

When this method is called, it causes the browser to navigate to the previous page in the current history list . The forward function can be achieved by changing the numeric parameter to a positive number:

history.go(1);

When this method is called, the browser will navigate to the current history list The next page, that is, navigate forward.

3. Operate the browser's return button

To operate the browser's return button, we need to use the browser's events. For example, we can add a button to the page and then use the following code to control the back function:

window.history.back();

When the user clicks the button, the page will Return to the last visited page. In addition, we can also use the onbeforeunload event of the window object, which will be triggered just before the page is unloaded. We can prompt the user in this event whether to leave the current page:

window.onbeforeunload = function() {

return "确定要离开当前页面吗？";

}

When the user clicks the browser return button , a prompt box will pop up allowing the user to choose whether to leave the current page.

Summary

JavaScript's back method is one of the most commonly used functions in web development, which can help users navigate to recent access records in the browser. We can use the window.history.back() and history.go() methods to implement the back function, and we can control the browser's back button through buttons and events. With the continuous development of web development technology, we can use more methods to implement the back function. However, no matter which method is used, we should pay attention to browser compatibility and security, and ensure that our code is concise, effective, easy to maintain and upgrade.

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