js自动合并值重复的单元格

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;

        //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;

                }

            }

        }

    }