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合并单元格要求：
1、把列或行中相邻的单元格中具有相同内容的单元格合并起来。
2、把列或行中具有相同内容的单元格合并起来。
3、仅合并列
4、仅合并行
<script type="text/javascript">
//功能：合并表格
//参数：tb－需要合并的表格ID
//参数：colLength－－需要对前几列进行合并，比如，
//想合并前两列，后面的数据列忽略合并，colLength应为2
//缺省表示对全部列合并
function uniteTable(tb, colLength) {
//检查表格是否规整
if (!checkTable(tb)) return;
var i = 0;
var j = 0;
var rowCount = tb.rows.length; //行数
var colCount = tb.rows[0].cells.length; //列数
var obj1 = null;
var obj2 = null;
//为每个单元格命名
for (i = 0; i < rowCount; i++) {
for (j = 0; j < colCount; j++) {
tb.rows[i].cells[j].id = "tb__" + i.toString() + "_" + j.toString();
}
}
//逐列检查合并
for (i = 0; i < colCount; i++) {
if (i == colLength) return;
obj1 = document.getElementById("tb__0_" + i.toString())
for (j = 1; j < rowCount; j++) {
obj2 = document.getElementById("tb__" + j.toString() + "_" + i.toString());
if (obj1.innerText == obj2.innerText) {
obj1.rowSpan++;
obj2.parentNode.removeChild(obj2);
} else {
obj1 = document.getElementById("tb__" + j.toString() + "_" + i.toString());
}
}
}
}
//功能：检查表格是否规整
//参数：tb－－需要检查的表格ID
function checkTable(tb) {
if (tb.rows.length == 0) return false;
if (tb.rows[0].cells.length == 0) return false;
for (var i = 0; i < tb.rows.length; i++) {
if (tb.rows[0].cells.length != tb.rows[i].cells.length) return false;
}
return true;
}
</script>
</head>
<body>
<table width="400" border="1" id="table1">
<tr>
<td>
a
</td>
<td>
for
</td>
<td>
100
</td>
<td>
200
</td>
</tr>
<tr>
<td>
a
</td>
<td>
for
</td>
<td>
100
</td>
<td>
300
</td>
</tr>
<tr>
<td>
a
</td>
<td>
if
</td>
<td>
100
</td>
<td>
200
</td>
</tr>
<tr>
<td>
a
</td>
<td>
if
</td>
<td>
300
</td>
<td>
230
</td>
</tr>
<tr>
<td>
a
</td>
<td>
if
</td>
<td>
320
</td>
<td>
230
</td>
</tr>
</table>
<br />
<input type="button" value="合并表格" οnclick="uniteTable(table1,4)" />
</body>
</html>
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