JavaScript遍历HTML表格所有单元格数据

function GetInfoFromTable(tableid) {
  var tableInfo = "";
  var tableObj = document.getElementById(tableid);
  for (var i = 0; i < tableObj.rows.length; i++) {  //遍历Table的所有Row
    for (var j = 0; j < tableObj.rows[i].cells.length; j++) {  //遍历Row中的每一列
      tableInfo += tableObj.rows[i].cells[j].innerText;  //获取Table中单元格的内容
      tableInfo += "  ";
    }
    tableInfo += "\n";
  }
  return tableInfo;
}