vue.esm.js?efeb:591 [Vue warn]: Property or method "item" 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

 [Vue warn]: Property or method "item" 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.

點擊刪除按鈕的時候報出的錯誤如圖所示：

父組件search.vue的源碼的delete是子組件search-list派發而來的自定義事件，該錯誤發生的原因是在deleteSearch中添加了item，而此時的item並沒有在data中定義，所以會報次錯誤，item是子組件search-list通過派發自定義事件delete時，傳過來的參數，在父組件的模版（template）中不需要寫，直接在 定義deleteSearch方法時帶入就可以了