el-table-column格式化时间

<el-table-column prop="visit_date" label="挂号时间" :formatter="formatDate">
</el-table-column>

const formatDate = (row, column) => {
  // 获取单元格数据
  let data = row[column.property];
  if (data == null) {
    return null;
  }
  let dt = new Date(data);
  return (
    dt.getFullYear() +
    "-" +
    (dt.getMonth() + 1) +
    "-" +
    dt.getDate() +
    " " +
    dt.getHours() +
    ":" +
    dt.getMinutes() +
    ":" +
    dt.getSeconds()
  );
};