Javascript获取页面表格中的数据

var main=mygrid.gettable("11");  //表示获取非固定列的表格    
var main1=mygrid.gettable("01");//表示获取固定列的表格 
    ///var quantity= mygridgetcolnumber(0,"quantity");
    //var per_quantity= mygridgetcolnumber(0,"per_quantity");
    var planquantity= mygridgetcolnumber(0,"planquantity");
var lastcount= mygridgetcolnumber(0,"lastcount");
//得到lastcount对应的列数，在第几列上面
    ///var goodspack= mygridgetcolnumber(0,"goodspack");
   // var contract_code= mygridgetcolnumber(0,"contract_code");
    ///var zy_code= mygridgetcolnumber(0,"zy_code");
alert(mygrid.gettable("11").rows.length+"===")
//获取表格的行数
    if(mygrid.gettable("11").rows.length>0){
        for(var i=0;i<=mygrid.gettable("11").rows.length-2;i++){   
Var planquantity2=main.rows(i).cells(planquantity).childNodes[0].value;//获取input类型的列名为planquantity的各行的值
            alert(planquantity2);
Var lastcount2=main.rows(i).cells(lastcount).innerText; 
//获取label类型的列名为lastcount的各行的值
//main.rows(i).cells(lastcount).childNodes[0].value;
            alert(lastcount2);
            if(planquantity2 > lastcount2){
                //alert("请输入数量（担）!");
                alert("输入数量(担)不能超过剩余量！");
                main.rows(i).cells(planquantity).childNodes[0].focus();
                return;
            }
            return;
        }
    }