Property or method “xxx” is not defined on the instance but referenced during render
Translation : During instance rendering, property or method XXX is not defined.
In fact, the error is already obvious, it is not defined. Because js does not perform syntax checking, undefined warnings are common. The most important thing is to be careful. If the code is not standardized, your loved ones will shed tears.
Solution : In the file with the warning prompt, find the changed attribute or method and redefine it in data or methods.