使用el-date-picker报错

如下报错：

[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: "placement"

 原因：版本问题

解决方案：

1.降版本

2.在el-date-picker里添加align="center"

<el-date-picker
          :v-model="time"
          type="daterange"
          range-separator="至"
          start-placeholder="开始日期"
          end-placeholder="结束日期"
        >
</el-date-picker>