el-popover弹出框在表格中重复出现

 表格部分代码

el-popover绑定ref

// 表头配置框得点击
    downBtn() {
      this.showOrHide = true
      this.$nextTick(() => {
          this.$refs['popover'].$refs.popper.previousSibling.style.display = 'none'
      })
    }