Vue问题-- Property or method "showHistoryR" is not defined on the instance but referenced

问题:
属于vue.js 597行问题

Property or method "showHistoryR" 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.

Vue问题-- Property or method

解决方法:
1.先查看methods是否写成“method”等错误内容
2.查看html中使用的方法或变量,没有在new vue()中定义

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