js必须等表格加载完成后调用。 效果如图：

js代码：

function uniteTable(tableId,colLength) {

//colLength-- 需要合并单元格的列1开始

var tb=document.getElementById(tableId);

tb.style.display='';

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;

var obj3 = 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();

}

}

//合并行

for (i = 0; i < colCount; i++) {

if (i == colLength) break;

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());

}

}

}

//合并列

for (i = 0; i < rowCount; i++) {

colCount = tb.rows[i].cells.length;

obj1 = document.getElementById(tb.rows[i].cells[0].id);

for (j = 1; j < colCount; j++) {

if (j >= colLength) break;

if (obj1.colSpan >= colLength) break;

obj2 = document.getElementById(tb.rows[i].cells[j].id);

if (obj1.innerText == obj2.innerText) {

obj1.colSpan++;

obj2.parentNode.removeChild(obj2);

j = j - 1;

}

else {

obj1 = obj2;

j = j + obj1.rowSpan;

}

}

}

}

优化后的效果(这里只实现了合并行)： 效果图如下：

代码如下：

function uniteTable(tableId,colLength) {

//colLength-- 需要合并单元格的列1开始

var tb=document.getElementById(tableId);

tb.style.display='';

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;

var obj3 = 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();

}

}

//合并行 (列循环)第一行第一列均从0开始

for (i = 0; i < colCount; i++) {

//如果第3，4，5列不进行合并操作

if (i == 2 || i == 3 || i == 4) continue;

obj1 = document.getElementById("tb__0_" + i.toString())

//(行循环)

for (j = 1; j < rowCount; j++) {

obj2 = document.getElementById("tb__" + j.toString() + "_" + i.toString());

if(i == 0){//第1列全部进行合并操作

if (obj1.innerText == obj2.innerText) {//判断值是否相等

obj1.rowSpan++;//合并行

obj2.parentNode.removeChild(obj2);//移除被合并的行

} else {

obj1 = document.getElementById("tb__" + j.toString() + "_" + i.toString());

}

}else if(i == 5){//第6列合并操作参照第2列，第二列合并了，第5列才进行合并

obj3 = document.getElementById("tb__" + j.toString() + "_" + (i-4).toString());

if (obj1.innerText == obj2.innerText && obj3 == null) {

obj1.rowSpan++;

obj2.parentNode.removeChild(obj2);

} else {

obj1 = document.getElementById("tb__" + j.toString() + "_" + i.toString());

}

}else{//只有前一列进行了合并操作后面的才会进行合并操作

obj3 = document.getElementById("tb__" + j.toString() + "_" + (i-1).toString());

if (obj1.innerText == obj2.innerText && obj3 == null) {

obj1.rowSpan++;

obj2.parentNode.removeChild(obj2);

} else {

obj1 = document.getElementById("tb__" + j.toString() + "_" + i.toString());

}

}

}

}

}