1，双击事件：给table添加自定义事件row-dblclick，包含三个入参row, event, column

 2，复制想要内容到粘贴板

handleTableRow(row, event, column){

      let oInput = document.createElement('input');

      oInput.value = decodeURIComponent(row.msg)

      document.body.appendChild(oInput)

      oInput.select()

      document.execCommand('Copy')

      this.$message.success('复制成功！')

      oInput.remove()

    }