js中的另类写法(转)

function SelAll()
         {
             var RowCnt=<%=RowCount%>;
             var IsChk;
             IsChk = document.all.CheckAll.checked;
             for(j= 0;j<RowCnt+1;j ++ )
             {
                 if(typeof(document.all.dgCheckBox.rows(j).cells(0).children(0)) == "object")
                 {
                    document.all.dgCheckBox.rows(j).cells(0).children(0).checked = IsChk;
            
                }
            }

        }