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>