[Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value. Prop being
[Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value. Prop being mutated: "openFlag"
此错误出现的原因是：vue设计是单向数据流，数据的流动方向只能是自上往下的方向，所以在子组件中不能修改props接收到的值，解决办法是将值赋给一个新的变量
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参考文章 https://juejin.im/post/5cccf5b0e51d453a907b4af1