js动态的合并table的单元格
<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">
<tbody>
<tr>
<th>c1th>
<th>c2th>
<th>c3th>
<th>c4th>
<th>c5th>
<th>c6th>
tr>
<tr>
<td>atd>
<td>1td>
<td>2td>
<td>3td>
<td>4td>
<td>5td>
tr>
<tr>
<td>atd>
<td>1td>
<td>3td>
<td>4td>
<td>5td>
<td>6td>
tr>
<tr>
<td>atd>
<td>2td>
<td>3td>
<td>3td>
<td>4td>
<td> td>
tr>
<tr>
<td>atd>
<td>2td>
<td>4td>
<td>5td>
<td>6td>
<td> td>
tr>
<tr>
<td>btd>
<td>3td>
<td>4td>
<td>6td>
<td>7td>
<td> td>
tr>
<tr>
<td>btd>
<td>3td>
<td>5td>
<td>6td>
<td>7td>
<td> td>
tr>
<tr>
<td>cctd>
<td>2td>
<td>3td>
<td>4td>
<td>5td>
<td> td>
tr>
<tr>
<td>cctd>
<td>2td>
<td>3td>
<td>5td>
<td>5td>
<td> td>
tr>
<tr>
<td>dtd>
<td>1td>
<td>2td>
<td>3td>
<td>4td>
<td> td>
tr>
<tr>
<td>etd>
<td>1td>
<td>2td>
<td>3td>
<td>4td>
<td> td>
tr>
tbody>
table>
<br /> 合并后：
<br />
<table width="400" border="1" id="table1">
<tbody>
<tr>
<th>c1th>
<th>c2th>
<th>c3th>
<th>c4th>
<th>c5th>
<th>c6th>
tr>
<tr>
<td>atd>
<td>1td>
<td>2td>
<td>3td>
<td>4td>
<td>5td>
tr>
<tr>
<td>atd>
<td>1td>
<td>3td>
<td>4td>
<td>5td>
<td>6td>
tr>
<tr>
<td>atd>
<td>2td>
<td>3td>
<td>3td>
<td>4td>
<td> td>
tr>
<tr>
<td>atd>
<td>2td>
<td>4td>
<td>5td>
<td>6td>
<td> td>
tr>
<tr>
<td>btd>
<td>3td>
<td>4td>
<td>6td>
<td>7td>
<td> td>
tr>
<tr>
<td>btd>
<td>3td>
<td>5td>
<td>6td>
<td>7td>
<td> td>
tr>
<tr>
<td>cctd>
<td>2td>
<td>3td>
<td>4td>
<td>5td>
<td> td>
tr>
<tr>
<td>cctd>
<td>2td>
<td>3td>
<td>5td>
<td>5td>
<td> td>
tr>
<tr>
<td>dtd>
<td>1td>
<td>2td>
<td>3td>
<td>4td>
<td> td>
tr>
<tr>
<td>etd>
<td>1td>
<td>2td>
<td>3td>
<td>4td>
<td> td>
tr>
tbody>
table>
<script type="text/javascript">
//多级次动态合并表格行
function checkArray(arr1,arr2){
for (var i = 0; i < arr1.length; i++) {
if (arr1[i].innerText===arr2[i].innerText) {
}else{
return false;
}
}
return true;
}
function dynamicMergeTableRow(tableId){
var tb = document.getElementById(tableId);
var obj1;
var obj2;
var objtemp1 = [];
var objtemp2 = [];
var rowCount = tb.rows.length;
console.info(rowCount);
var colCount = tb.rows[0].cells.length;
console.info(rowCount);
var colLength = 4;
//命名(表头除外)
for (var i = 1; i < rowCount; i++) {
for (var j = 0; j < colCount; j++) {
tb.rows[i].cells[j].id = "tb_" + i.toString() + "_" + j.toString();
}
}
//从后往前检查，进行逐列检查合并,开始列为colLength-1
for (var col = colLength -1; col >= 0; col--) {
//当col>0时有前方的单元格
if (col > 0) {
//objtemp1为obj1左侧所有单元格集合，初始objtemp1及obj1均从第二行开始(tb_1_)
for (var l = 0; l < col; l++) {
objtemp1[l] = document.getElementById("tb_1_" + l.toString());
}
}
obj1 = document.getElementById("tb_1_" + col.toString());
//obj2为obj1下方单元格,obj1从第二行开始，则obj2从第三行开始，遍历以row=2为起始值
for (var row = 2; row < rowCount; row++) {
//同obj1及objtemp1，col>0：即有前方单元格，此时有objtemp2
if (col > 0) {
for (var l = 0; l < col; l++) {
objtemp2[l] = document.getElementById("tb_" + row.toString() +"_"+ l.toString());
}
}
obj2 = document.getElementById("tb_" + row.toString() +"_"+ col.toString());
//定义完obj1/obj2/objtemp1/objtemp2后，开始合并
//第一层判断：当obj1的值等于obj2时，即同一列的相邻单元格值相同
if (obj1.innerText == obj2.innerText) {
//第二层判断：obj1/obj2所在列前方还有其他列：即col>0(此步判断为单元格合并的依赖性提供支持)
if (col > 0) {
//第三层判断：obj1/obj2所在列前方还有其他列，且objtemp1,objtemp2值完全相同，可以合并
if (checkArray(objtemp1,objtemp2)) {
obj1.rowSpan++;
obj2.parentNode.removeChild(obj2);
}
//第三层判断：obj1/obj2所在列前方还有其他列，且objtemp1,objtemp2值不同，不可合并，并重新对obj1/objtemp1赋值，令其等于原来的obj2/objtemp2
else{
obj1 = document.getElementById("tb_" + row.toString() +"_"+ col.toString());
for (var l = 0; l < col; l++) {
objtemp1[l] = document.getElementById("tb_" + row.toString() +"_"+ l.toString());
}
}
}
//第二层判断：obj1/obj2所在列为首列，直接合并
else{
obj1.rowSpan++;
obj2.parentNode.removeChild(obj2);
}
}
//第一层判断：当obj1的值不等于obj2时，即同一列的相邻单元格值不相，此时重新对obj1/objtemp1赋值，令其等于原来的obj2/objtemp2
else{
obj1 = document.getElementById("tb_" + row.toString() +"_"+ col.toString());
for (var l = 0; l < col; l++) {
objtemp1[l] = document.getElementById("tb_" + row.toString() +"_"+ l.toString());
}
}
}
objtemp1 = [];
objtemp2 = [];
}
}
dynamicMergeTableRow('table1');
script>
body>
html> 原文章：
http://blog.csdn.net/galeno1994/article/details/73800955