解决问题：Avoid mutating a prop directly since the value will be overwritten whenever the parent component ...

报错：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: "treeData"

通过props传递给子组件的treeData，不能在子组件内部修改props中的treeData的值。