vue.runtime.esm.js:587 [Vue warn]: Property or method "formatter" 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://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.
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因此在自己的文件中的data初始化屬性
