代码可以这样操作吗？


   function execl()
        {
            var id = document.getElementById("txtSelectUserID").value;
            var line = document.getElementById("txtLine").value;
            if (line = "")
            {
                winOpen("inc/ExportExcel.aspx?id=" + id + "");
            }
            else if (id = "")
            {
                winOpen("inc/ExportExcel.aspx?line=" + line + "");
            }
            else
            {
                winOpen("inc/ExportExcel.aspx?line=" + line + " and id=" + id + "");
            }
        }