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

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"

found in

如图：

解决办法：

降一下element-ui 版本接口

原因：开发过程中有用到element-ui组件的DatePicker 日期选择器当时为了适配一个报错性能，把element-ui下了最新版本2.15.9 ，导致后续删掉之后还一直报这个错，虽然对项目整体不构成影响，但看着实属难受，所以解决啦！

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