合并思路如下：

?????? 1、根据单元格内容或单元格属性找出需要合并的单元格

???????2、修改起始单元格colspan值

?????? 3、删除多余的单元格

单元格合并代码如下：

/************************************* table单元格合并 ***********************************************
??合并指定table 指定列 相同数据的单元格 table:table对象? colInx:需要合并的列的index columns:table总列数
??opts:{columns:总列数,skipNull:是否忽略空单元格的合并 mergeAttrName }
?**********************************************************************************************/
?mergeTalbeVCells = function(table,colInx,opts){
???var option = {skipNull:false};
???$.extend(option,opts);
??????? var cols = option.columns || table.rows[0].cells.length;
??var colArr = [];
??var rows = table.rows.length;
??var n = 1;
??for(var i=0;i<rows;i++){
???var currtxt = '';
???if(option.mergeAttrName){
????currtxt = table.rows[i].cells[colInx - (cols - table.rows[i].cells.length)].getAttribute(option.mergeAttrName);
???}else{
????currtxt = table.rows[i].cells[colInx - (cols - table.rows[i].cells.length)].innerText;
???}
???var nexttxt;
???if(i < rows-1){
????if(option.mergeAttrName){
?????nexttxt = table.rows[i+1].cells[colInx - (cols - table.rows[i+1].cells.length)].getAttribute(option.mergeAttrName);
????}else{
?????nexttxt = table.rows[i+1].cells[colInx - (cols - table.rows[i+1].cells.length)].innerText;
????}
???}else{
????colArr[colArr.length] = {rowInx:((i+1)-n),rowSpan:n};
???}
???if(currtxt != nexttxt){
????colArr[colArr.length] = {rowInx:(i-n+1),rowSpan:n};
????n = 0;
???}else if(currtxt=="" && nexttxt==""){
????//? 是否忽略空字符
????if(option.skipNull){
?????colArr[colArr.length] = {rowInx:0,rowSpan:1};
?????n = 0;
????}
???}
???n++;
??}
??// 合并相同数据的单元格
??for(var i=0;i<colArr.length;i++){
???table.rows[colArr[i].rowInx].cells[colInx - (cols - table.rows[colArr[i].rowInx].cells.length)].rowSpan = colArr[i].rowSpan;
???for(var j=1;j<colArr[i].rowSpan;j++){
????table.rows[colArr[i].rowInx*1+j].deleteCell(colInx - (cols - table.rows[colArr[i].rowInx*1+j].cells.length));
???}
??}
}

?还原合并代码如下：

?

/******* 还原合并 *******/
?var restoreMergeTable = function(table,colInx,opts){
??var option = {skipNull:false};
??$.extend(option,opts);
??var cols = option.columns || table.rows[0].cells.length;
??var colArr = [];
??var rows = table.rows.length;
??var n = 1;
??for(var i=0;i<rows;i++){
???var cell = getCellByColInx(table.rows[i],colInx);
???if(!cell) continue;
???var rowSpan = cell.getAttribute("rowSpan");
???if(rowSpan<2) continue;
???for(var ri=1;ri<rowSpan;ri++){
???? copyCell(table.rows[i+ri].insertCell(0),cell,_this.option.userDatas);
???}
???cell.rowSpan = 1;
??}
?

??/************** 复制单元格 **************/
??function copyCell(res_cell,target_cell,attributes){
???res_cell.innerHTML = target_cell.innerHTML;
???if(attributes){
????for(var i=0,len=attributes.length;i<len;i++){
?????res_cell.setAttribute(attributes[i],target_cell.getAttribute(attributes[i]));
????}
???}
???res_cell.setAttribute("columnId",target_cell.getAttribute("columnId"));
????}
?}