## 使用下划线命名

 123 data () { _checked: false } 

## 产生报错

[Vue warn]: Property or method “_check” 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.

## 解决方法

 123 data () { isChecked: false }