vue.runtime.esm.js:619 [Vue warn]: Property or method "nameCh" 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:
属性或方法"nameCh"不是在实例上定义的，而是在渲染期间引用的。
通过初始化属性，确保此属性在 data 选项中或者在基于类的组件中
翻译一下就是template中有个地方你用了一个叫做nameCh的属性或者方法，但是在data或methods中没有这个nameCh