table表格的某一列的相同数据行合并

function fixRowspan() {
        var tb = document.getElementById("budgetItem"); //根据表格ID 获取表格
        var row_span_num = 1; 
        var first_row_title = ""; 
        var first_row_obj = null; 
        for ( var i = 1; i < tb.rows.length; i++) { 
            var first_new_row_title = tb.rows[i].cells[0].innerHTML; 
            if (first_row_title != "" && first_row_title == first_new_row_title) { 
                tb.rows[i].deleteCell(11); 
                tb.rows[i].deleteCell(10); 
                tb.rows[i].deleteCell(9); 
                row_span_num++; 
                first_row_obj4.setAttribute("rowSpan", row_span_num); 
                first_row_obj3.setAttribute("rowSpan", row_span_num); 
                first_row_obj2.setAttribute("rowSpan", row_span_num); 
                first_row_obj.innerHTML = first_row_title.replace("/", "
"); 
            } else { 
                if (first_row_title != "") { 
                    first_row_obj4.setAttribute("rowSpan", row_span_num); 
                    first_row_obj3.setAttribute("rowSpan", row_span_num); 
                    first_row_obj2.setAttribute("rowSpan", row_span_num); 
                    first_row_obj.innerHTML = first_row_title.replace("/", "
"); 
                    row_span_num = 1; 
                } 
                first_row_obj = tb.rows[i].cells[0]; 
                first_row_obj4 = tb.rows[i].cells[11]; 
                first_row_obj3 = tb.rows[i].cells[10]; 
                first_row_obj2 = tb.rows[i].cells[9]; 
                first_row_title = first_new_row_title; 
            } 
            
        } 

}