报错：Property or method “total“ is not defined on the instance but referenced during render.
[Vue warn]: Property or method "total" 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,
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[Vue warn]: Property or method "total" 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.
我这里 引号里引的是 “ total ”
那么复制这个引号里的内容 到代码里找
将 引号里的内容 “ total ” 在 return里定义一下 就可以了
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