Property or method xxxx is not defined on the instance but referenced during render.
[Vue warn]: Property or method "getdata" 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.
解决方案，注意App.vue的methods厘米面的的getdata的大小写和上面的template中的一致。
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