通过js 向table添加或修改row及cell

//取得table对象
        var tabObj = document.getElementById("tabTipResult");
    //目前table有多少行
        var rowCount = tabObj.rows.length;
    //每行有多少列
        var cellCount = tabObj.rows(0).cells.length;

        if(rowCount < pageCount)
        {
            for(var i=0;i< pageCount ;i++)
            {
        //循环 向table增加新行
                var newRow = tabObj.insertRow(rowCount++);  
                for(var j=0;j<cellCount;j++)          
                {
            //每行的新列值    
                    newRow.insertCell(j).innerHTML="无";            
                }
            }
        }
        else
        {
            for(var i=1;i<= pageCount ;i++)
            {
                var tmpRow = tabObj.rows(i);  
                for(var j=0;j<cellCount;j++)          
                {
                    tmpRow.cells(j).innerHTML="无";            
                }
        //该行的背景色属性
        tmpRow .onmouseout = function(){this.bgColor="white";};
        tmpRow .onmouseover= function(){this.bgColor="#efffff";};
        //td 在 onclick事件
        tmpRow .cells(0).onclick = function(){ alert("");};   
            }
        }