超级强大的表单验证

     case "LimitB" :
     case "SafeString" :
      if(!eval(this[_dataType])) {
       this.AddError(i, getAttribute("msg"));
      }
      break;
     default :
      if(!this[_dataType].test(value)){
       this.AddError(i, getAttribute("msg"));
      }
      break;
    }
   }
  }
  if(this.ErrorMessage.length > 1){
   mode = mode || 1;
   var errCount = this.ErrorItem.length;
   switch(mode){
   case 2 :
    for(var i=1;i<errCount;i++)
     this.ErrorItem[i].style.color = "red";
   case 1 :
    alert(this.ErrorMessage.join("n"));
    this.ErrorItem[1].focus();
    break;
   case 3 :
    for(var i=1;i<errCount;i++){
    try{
     var span = document.createElement("SPAN");
     span.id = "__ErrorMessagePanel";
     span.style.color = "red";
     this.ErrorItem[i].parentNode.appendChild(span);
     span.innerHTML = this.ErrorMessage[i].replace(/d+:/,"*");
     }
     catch(e){alert(e.description);}
    }
    this.ErrorItem[1].focus();
    break;
   default :
    alert(this.ErrorMessage.join("n"));
    break;
   }
   return false;
  }
  return true;
 },
 limit : function(len,min, max){
  min = min || 0;
  max = max || Number.MAX_VALUE;
  return min <= len && len <= max;
 },
 LenB : function(str){
  return str.replace(/[^x00-xff]/g,"**").length;
 },
 ClearState : function(elem){
  with(elem){
   if(style.color == "red")
    style.color = "";
   var lastNode = parentNode.childNodes[parentNode.childNodes.length-1];
   if(lastNode.id == "__ErrorMessagePanel")
    parentNode.removeChild(lastNode);
  }
 },
 AddError : function(index, str){
  this.ErrorItem[this.ErrorItem.length] = this.ErrorItem[0].elements[index];
  this.ErrorMessage[this.ErrorMessage.length] = this.ErrorMessage.length + ":" + str;