JS动态合并单元格

	/**
	动态合并单元格
	tableId:表格ID
	colLength：循环检查前多少列单元格
	*/
	function uniteTable(tableId, colLength) {//表格ID，表格列数
       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;

        //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 < colLength; i++) {
            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 && ((obj2.innerText != "" || obj1.innerText != "") &&(obj1.innerText != "-" || obj2.innerText != "-"))) {
                    obj1.rowSpan++;
                    obj2.parentNode.removeChild(obj2);
                } else {
                    obj1 = document.getElementById("tb__" + j.toString() + "_" + i.toString());
                }
            }
        }

        //合并列
        for (i = 1; i < rowCount; i++) {
            colCount = tb.rows[i].cells.length;
            obj1 = document.getElementById(tb.rows[i].cells[0].id);
            for (j = 1; j < colLength; j++) {
                if (obj1.colSpan >= colLength) break;
                obj2 = document.getElementById(tb.rows[i].cells[j].id);
                if (obj1.innerText == obj2.innerText && ((obj2.innerText != "" || obj1.innerText != "")&&(obj1.innerText != "-"|| obj2.innerText != "-"))) {
                    obj1.colSpan++;
                    obj2.parentNode.removeChild(obj2);
                }
                else {
                    obj1 = obj2;
                }
            }
        }
    }