效果图: 
HTML代码:
复制代码 代码如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>表格相同内容合并</title>
</head>
<body>
合并前：
<table width="400" border="1">
<tr>
<td>a</td>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td>5</td>
</tr>
<tr>
<td>a</td>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td>6</td>
</tr>
<tr>
<td>a</td>
<td>2</td>
<td>3</td>
<td>3</td>
<td>4</td>
<td> </td>
</tr>
<tr>
<td>b</td>
<td>3</td>
<td>4</td>
<td>6</td>
<td>7</td>
<td> </td>
</tr>
<tr>
<td>b</td>
<td>3</td>
<td>5</td>
<td>6</td>
<td>7</td>
<td> </td>
</tr>
<tr>
<td>cc</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td>5</td>
<td> </td>
</tr>
<tr>
<td>cc</td>
<td>2</td>
<td>3</td>
<td>5</td>
<td>5</td>
<td> </td>
</tr>
<tr>
<td>d</td>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td> </td>
</tr>
<tr>
<td>e</td>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td> </td>
</tr>
</table><br />
合并后：<br />
<table width="400" border="1" id="table1">
<tr>
<td>a</td>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td>5</td>
</tr>
<tr>
<td>a</td>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td>6</td>
</tr>
<tr>
<td>a</td>
<td>2</td>
<td>3</td>
<td>3</td>
<td>4</td>
<td> </td>
</tr>
<tr>
<td>b</td>
<td>3</td>
<td>4</td>
<td>6</td>
<td>7</td>
<td> </td>
</tr>
<tr>
<td>b</td>
<td>3</td>
<td>5</td>
<td>6</td>
<td>7</td>
<td> </td>
</tr>
<tr>
<td>cc</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td>5</td>
<td> </td>
</tr>
<tr>
<td>cc</td>
<td>2</td>
<td>3</td>
<td>5</td>
<td>5</td>
<td> </td>
</tr>
<tr>
<td>d</td>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td> </td>
</tr>
<tr>
<td>e</td>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td> </td>
</tr>
</table>
</body>
</html>
JS:
复制代码 代码如下:
<script type="text/javascript">
function mc(tableId, startRow, endRow, col) {
var tb = document.getElementById(tableId);
if (col >= tb.rows[0].cells.length) {
return;
}
if (col == 0) { endRow = tb.rows.length-1; }
for (var i = startRow; i < endRow; i++) {
if (tb.rows[startRow].cells[col].innerHTML == tb.rows[i + 1].cells[0].innerHTML) {
tb.rows[i + 1].removeChild(tb.rows[i + 1].cells[0]);
tb.rows[startRow].cells[col].rowSpan = (tb.rows[startRow].cells[col].rowSpan | 0) + 1;
if (i == endRow - 1 && startRow != endRow) {
mc(tableId, startRow, endRow, col + 1);
}
} else {
mc(tableId, startRow, i + 0, col + 1);
startRow = i + 1;
}
}
}
mc('table1',0,0,0);
</script>