报错：use a data or computed property based on the prop‘s value. Prop being mutated: “placement“

报错信息

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: "placement"

避免直接更改道具，因为每当父组件重新渲染时，该值都会被覆盖。相反，使用基于道具值的数据或计算属性。道具正在变异：“放置”

解决方法

添加属性：align="center"

报错原因

element-ui版本问题