Property or method “changeColor“ is not defined on the instance but referenced during render.Make su

vue.runtime.esm.js?2b0e:4605 [Vue warn]: Property or method “changeColor” is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or for class-based components, by initializing the property. See: https://v2.vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.

这是因为我多了一个methods，遇到这种就检查看看哪里是否有重复的。