学步园

http://www.webxpertz.net/forums/printthread.php?t=31724
function checkOne(frm){
  var oneFilled = false;
  for(var i = 0;i < frm.elements.length;i++){
    switch(frm.elements[i].type){
      case "text": oneFilled = frm.elements[i].value.length > 0;break;
      case "radio":;
      case "checkbox":oneFilled = frm.elements[i].checked;break;
      case "textArea":oneFilled = frm.elements[i].value.length > 0;break;
      case "select":oneFilled = frm.elements[i].selectedIndex > -1;break;
    }
    if(oneFilled) break;
  }
  return oneFilled;
}