js合并行

网上找了好久才找到，在这记录下。

 <script type="text/javascript" >
         function MergerRow(ID) {
             var tab = document.getElementById(ID);
             var maxCol = 6, val, count, start;  //maxCol：合并单元格作用到多少列
             for (var col = maxCol - 1; col >= 0; col--) {
                 count = 1;
                 val = "";
                 for (var i = 0; i < tab.rows.length; i++) {
                     if (tab.rows[i].cells.length == 0 || tab.rows[i].cells[0].tagName.toLowerCase() == 'th') {
                         continue;
                     }

                     if (val == tab.rows[i].cells[col].innerHTML) {
                         count++;
                     } else {
                         if (count > 1) { //合并
                             start = i - count;
                             tab.rows[start].cells[col].rowSpan = count;
                             for (var j = start + 1; j < i; j++) {
                                 tab.rows[j].cells[col].style.display = "none";
                             }
                             count = 1;
                         }
                         val = tab.rows[i].cells[col].innerHTML;
                     }
                 }
                 if (count > 1) { //合并，最后几行相同的情况下
                     start = i - count;
                     tab.rows[start].cells[col].rowSpan = count;
                     for (var j = start + 1; j < i; j++) {
                         tab.rows[j].cells[col].style.display = "none";
                     }
                 }
             }

         }
     </script>