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.
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