How to close the current page prompt in javascript

Sometimes in website production, in order to give users a better experience, we may need to prompt some information when the user closes the page to let the user confirm whether they really want to close the page. JavaScript can easily achieve this requirement.

First of all, we must make it clear that closing the browser window is a behavior of the user's operating system. If the user wants to close the window directly, we cannot prevent it, but we can prompt the user whether to close the page and let the user make a decision.

Using JavaScript's window.onbeforeunload event, you can detect whether the user is closing the page. This event will be triggered when the user tries to close the window, at which time we can prompt the user with information in the pop-up window.

For example, when the user wants to close the page, a prompt box pops up with a message: "Are you sure you want to close the page?". If the user clicks OK, the page will be closed. If the user clicks cancel, the page does not close. Here is the JavaScript code that implements this functionality:

window.onbeforeunload = function() {
  return "确定要关闭页面吗？";
}

Here, we define an event handler called window.onbeforeunload. The event handler returned a string, "Are you sure you want to close the page?". When this event fires, the browser displays the string in a pop-up box.

When using this method, we need to pay attention to the following points:

1. This method will only be triggered when the user tries to close the window. If the user directly closes the browser, this method will Unable to trigger.
2. This method may behave differently in different browsers. For example, in the Chrome browser, this method is also triggered if the user attempts to refresh the page. Therefore, the code needs to be adjusted appropriately according to different browsers.
3. This method may affect website performance. This method will be triggered every time the user closes the page, and we need to confirm whether we really need this functionality.

In short, using JavaScript to turn off the current page prompt is a very useful technique for website production. We can use this to improve user experience and ensure users are aware that they are closing the page.

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