vue qq third party exit error

Preface

When developing Vue's QQ third-party login function, you may encounter the problem of error when exiting. This article will introduce the principle of this problem and how to solve it, hoping to be helpful to developers.

Problem Description

When using Vue to develop QQ third-party login function, when the user tries to log out, the following error will appear:

Uncaught TypeError: Cannot read property ' open' of null

This error will appear when executing the following code:

window.open("https://graph.qq.com/oauth2.0/logout?access_token=" token "&callback=message");

The reason for this error is that when the window.open method is executed, the page has been unloaded, and JavaScript still regards this code as executable code. Since the page has been unloaded, JavaScript cannot obtain the corresponding DOM element, which will cause this error to appear.

Solution

The root cause of the problem is that the logout code is executed at the wrong time. The code should not be able to perform the logout responsibility normally until the DOM has been loaded. In order to solve this problem, we can consider implementing the logout logic in the Vue component life cycle function.

Specifically, you can add the following code in the beforeMount life cycle function of the Vue component:

window.addEventListener('beforeunload', function () {

const token = localStorage.getItem('token');
if (token) {
    window.open(`https://graph.qq.com/oauth2.0/logout?access_token=${token}&callback=message`, '_self');
}

} );

The main function of this code is to listen to the beforeunload event before the component is about to be mounted, and then execute the relevant code to exit the QQ account. Using this method, even if the page has been uninstalled, the above error will no longer appear when logging out of the QQ account.

Summary

This article mainly introduces the problem of logout error when using the QQ third-party login function in Vue, and provides detailed solutions. When implementing similar functions, you need to pay attention to the timing of code execution, especially under front-end frameworks such as Vue. Because of their life cycle characteristics, the chance of errors will be greater. Therefore, when writing similar functions, you need to be particularly careful and read the relevant documents carefully to avoid similar problems.

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