JavaScript in the mobile browser closes the browser pop-up prompt box

In recent years, with the continuous improvement of the intelligence of mobile phones, more and more people have begun to use mobile browsers to browse and operate web pages. As a developer, how to implement some common functions in mobile browsers has also become particularly important. This article will introduce how to use JavaScript technology to close the browser pop-up prompt box in the mobile browser.

In many cases, when we close a tab page or the entire browser in a mobile browser, a prompt box will pop up asking us to confirm the closure. The purpose of this prompt box is to prevent misoperation and prevent us from accidentally closing the tab or browser. But in some cases, we may want to close the browser without confirming again. In this case, we can use JavaScript technology to solve the problem.

To implement this function, you first need to obtain the current browser through javascript, which can be achieved through the navigator object. Then, we need to execute a script when the browser window is closed, which can be achieved through the onbeforeunload event in the window object. Finally, we only need to set the content of the pop-up prompt box in the execution script to achieve the effect of no longer pop-up the prompt box and directly close the browser.

Below, we will introduce in detail how to prevent the prompt box from popping up when closing the browser. The specific steps are as follows:

Step 1: Get the current browser through javascript

We can use the navigator.userAgent property to obtain the current browser information. This property returns a string containing browser type, version number and other information. For example, we can get the current browser information through the following code:

var userAgent = navigator.userAgent;

Step 2: Execute the script through the onbeforeunload event

When the browser is closed, you can use the window object onbeforeunload event to execute a script. This event will be triggered when the user closes the browser or refreshes the page, so we can set the content of the prompt box in this event to no longer pop up. The following is the basic usage of this event:

window.onbeforeunload = function() {
    //执行一些脚本
    return "确定关闭浏览器吗？";
}

In this code, we use an anonymous function to execute the script and return a string. This string will be displayed in the browser as the content of a pop-up prompt box, asking the user if they are sure to close the browser.

Step 3: Set the content of the prompt box that will no longer pop up

To achieve the effect of no longer popping up the prompt box, we only need to set the content of the string to empty. In this way, when the user closes the browser, no prompt box will pop up and the browser is closed directly. The following is the modified code:

window.onbeforeunload = function() {
    //执行一些脚本
    return "";
}

In this code, we only need to change the previous string content to an empty string.

Summary:

Through the above steps, we can achieve the effect of no longer popping up prompt boxes in the browser. It should be noted that in actual applications, we may need to add some additional functions, such as performing certain operations when closing the browser, determining the browser type, etc. Therefore, we need to adjust and modify it according to the specific application needs.

In addition, it should be noted that in some browsers, the browser close event may be disabled. Therefore, in practical applications, we need to test the effects in different browsers and make targeted adjustments.

Finally, we need to remind you that the prompt box will no longer pop up when you close the browser, which may bring some risks and hidden dangers, so you need to use it with caution. In practical applications, we need to make choices based on specific circumstances and conduct sufficient testing and risk assessment.

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