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This error usually occurs where the problem occurs
ringa_lee
It is an error in the life cycle hook function. This function is called after a vue instance is generated. Maybe you called the defined functions, methods, objects, object properties, etc. before the life cycle
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
It is an error in the life cycle hook function. This function is called after a vue instance is generated. Maybe you called the defined functions, methods, objects, object properties, etc. before the life cycle