js动态合并table指定表格列、行

你可以使用JavaScript动态合并指定表格列或行来实现。以下是一个简单的示例代码：

合并指定列：

function mergeColumn(table, colIndex) {
  var rows = table.rows;
  var firstRow = rows[0];
  var cellCount = firstRow.cells.length;
  
  var start = 1;
  var end = 0;
  var prevValue = "";
  
  for (var i = 0; i < cellCount; i++) {
    if (i == colIndex) {
      for (var j = 1; j < rows.length; j++) {
        var currentValue = rows[j].cells[i].innerHTML;
        if (currentValue == prevValue) {
          end = j;
        } else {
          if (end > start) {
            mergeCells(rows, start, end, i);
          }
          prevValue = currentValue;
          start = j;
          end = j;
        }
      }
      if (end > start) {
        mergeCells(rows, start, end, i);
      }
      break;
    }
  } 
}

function mergeCells(rows, start, end, colIndex) {
  for (var i = start; i <= end; i++) {
    rows[i].cells[colIndex].rowSpan = end - start + 1;
    for (var j = colIndex + 1; j < rows[i].cells.length; j++) {
      rows[i].cells[j].style.display = "none";
    }
  }
}

合并指定行：

function mergeRow(table, rowIndex) {
  var rows = table.rows;
  var cells = rows[rowIndex].cells;
  var cellCount = cells.length;
  
  var start = 0;
  var end = 0;
  var prevValue = "";
  
  for (var i = 0; i < cellCount; i++) {
    var currentValue = cells[i].innerHTML;
    if (currentValue == prevValue) {
      end = i;
    } else {
      if (end > start) {
        mergeCells(rows, rowIndex, start, end);
      }
      prevValue = currentValue;
      start = i;
      end = i;
    }
  } 
  if (end > start) {
    mergeCells(rows, rowIndex, start, end);
  }
}

function mergeCells(rows, rowIndex, start, end) {
  rows[rowIndex].cells[start].colSpan = end - start + 1;
  for (var i = start + 1; i <= end; i++) {
    rows[rowIndex].deleteCell(start + 1);
  }
}

你可以根据需要调用这些函数来合并表格的指定列或行。例如，要合并第2列，可以调用mergeColumn(table, 1)函数。要合并第3行，可以调用mergeRow(table, 2)函数。