[vue warn]属性或方法"x"未在实例上定义但被渲染时引用

    Property or method "x" 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.
    
    found in
    
    ---> <Member> at src/components/Member.vue
       <Layout> at src/components/Layout.vue
         <App> at src/App.vue
           <Root>