What should I do if 'Error in callback for watcher 'xxx': 'TypeError: Cannot read property 'yyyy' of null' occurs when using vue-router in a Vue application?

When using vue-router in a Vue application, sometimes "Error in callback for watcher "xxx": "TypeError: Cannot read property 'yyyy' of null" will appear. Error message. This error is caused by vue-router routing not being configured correctly or being used incorrectly. This article will introduce how to solve this problem.

1. Check routing configuration

First, we need to check whether the routing configuration of vue-router is correct. In Vue applications, routing configuration is usually placed in a separate file, such as router.js. We can open this file first and check the routing Is the configuration correct and each route has a corresponding component.

If we find that the routing configuration is wrong, we need to correct it. If you are not sure how to correct it, you can check the Vue official documentation or seek help in the Vue community.

2. Check whether the component exists

If the routing configuration is correct, but an error message like "Cannot read property 'yyyy' of null" appears, it may be the corresponding component Does not exist. We need to check whether the component corresponding to the route exists and whether it has been imported correctly.

If the component does not exist, we need to create the component or change the component name in the routing configuration to the correct component Name.

3. Check route jump method

There are many ways to jump routes in Vue applications, such as using router-link, this.$router.push, etc. . We need to check whether the jump method used is correct. Sometimes we use the wrong way to jump to the route, causing the routing component to fail to render correctly, causing errors such as "Cannot read property 'yyyy' of null".

If the jump method is correct, but an error message still appears, you can try to use the Vue development tool to debug, check the specific error message, and find the problem. Generally speaking, the message of this error message is not very obvious, and you need to go through Only specific debugging can find the root cause of the problem.

Summary

The above three methods can help us solve the problem of "Error in callback for watcher "xxx": "TypeError" when using vue-router in Vue applications : Cannot read property 'yyyy' of null" error. If you still can't solve the problem, you can ask questions in the Vue community for help.

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