vue的属性名称与method的方法名称一样时会发生什么问题？

报warn，项目可以运行(vue2.5.17)。但data属性会覆盖methods定义的值，报属性已定义警告。

[Vue warn]: Method "xxx" has already been defined as a data property.
[Vue warn]: Error in mounted hook: "TypeError: this.xxx is not a function"
TypeError: this.xxx is not a function