c# js 删除table原行数据

function addtreetotable(obj){

var table1 =  document.getElementById("Table1");

var hang = obj.parentNode.parentNode.parentNode.childElementCount;

for(var int = 1;int <hang;int++) {
                table1.deleteRow(int);
                int--;
                var hh=obj.parentNode.parentNode.parentNode.childElementCount;
                if(hh==2)
                {
                    break;
                }
            }