function isANumber(number) {
  answer = 1;
  if (!parseFloat(number)) {
    //the first digit wasn't numeric
    answer = 0;
  } else {
    //the first digit was numeric, so check the rest
    for (vari=0; i<number.length; i++) {
      if ((number.charAt(i) != "0")
        && (!parseFloat(number.charAt(i)))) {
          answer = 0;
          break;
      }
    }
  }
  if (answer == 1) {
    orderPlaced = true;
  }
  return answer;
}


function isEmail(strEmail) {
if (strEmail.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
return true;
else
alert("oh");
}


function test() 
{
if(document.a.b.value.length>50)
{
alert("不能超过50个字符！");
document.a.b.focus();
return false;
}
}


function getStringLength(str){
  var endvalue=0;
  var sourcestr=new String(str);
  var tempstr;
  for (var strposition = 0; strposition < sourcestr.length; strposition ++) {
    tempstr=sourcestr.charAt(strposition);
    if (tempstr.charCodeAt(0)>255 || tempstr.charCodeAt(0)<0) {
      endvalue=endvalue+2;
    } else {
      endvalue=endvalue+1;
    }
  }
  return(endvalue);
}
function trim(str){
  if(str==null) return "";
  if(str.length==0) return "";
  var i=0,j=str.length-1,c;
  for(;i<str.length;i++){
    c=str.charAt(i);
    if(c!=' ') break;
  }
  for(;j>-1;j--){
    c=str.charAt(j);
    if(c!=' ') break;
  }
  if(i>j) return "";
  return str.substring(i,j+1); 
}
function validateDate(date,format,alt){
  var time=trim(date.value);
  if(time=="") return;
  var reg=format;
  var reg=reg.replace(/yyyy/,"[0-9]{4}");
  var reg=reg.replace(/yy/,"[0-9]{2}");
  var reg=reg.replace(/MM/,"((0[1-9])|1[0-2])");
  var reg=reg.replace(/M/,"(([1-9])|1[0-2])");
  var reg=reg.replace(/dd/,"((0[1-9])|([1-2][0-9])|30|31)");
  var reg=reg.replace(/d/,"([1-9]|[1-2][0-9]|30|31))");
  var reg=reg.replace(/HH/,"(([0-1][0-9])|20|21|22|23)");
  var reg=reg.replace(/H/,"([0-9]|1[0-9]|20|21|22|23)");
  var reg=reg.replace(/mm/,"([0-5][0-9])");
  var reg=reg.replace(/m/,"([0-9]|([1-5][0-9]))");
  var reg=reg.replace(/ss/,"([0-5][0-9])");
  var reg=reg.replace(/s/,"([0-9]|([1-5][0-9]))");
  reg=new RegExp("^"+reg+"$");
  if(reg.test(time)==false){//验证格式是否合法
    alert(alt);
    date.focus();
    return false;
  }
  return true;
}
function validateDateGroup(year,month,day,alt){
  var array=new Array(31,28,31,30,31,30,31,31,30,31,30,31);
  var y=parseInt(year.value);
  var m=parseInt(month.value);
  var d=parseInt(day.value);
  var maxday=array[m-1];
  if(m==2){
    if((y%4==0&&y%100!=0)||y%400==0){
      maxday=29;
    }
  }
  if(d>maxday){
    alert(alt);
    return false;
  }
  return true;
}
function validateCheckbox(obj,alt){
  var rs=false;
  if(obj!=null){
    if(obj.length==null){
      return obj.checked;
    }
    for(i=0;i<obj.length;i++){
      if(obj[i].checked==true){
        return true;
      }
    }
  }
  alert(alt);
  return rs;
}
function validateRadio(obj,alt){
  var rs=false;
  if(obj!=null){
    if(obj.length==null){
      return obj.checked;
    }
    for(i=0;i<obj.length;i++){
      if(obj[i].checked==true){
        return true;
      }
    }
  }
  alert(alt);
  return rs;
}
function validateSelect(obj,alt){
  var rs=false;
  if(obj!=null){
    for(i=0;i<obj.options.length;i++){
      if(obj.options[i].selected==true){
        return true;
      }
    }
  }
  alert(alt);
  return rs;
}
function validateEmail(email,alt,separator){
  var mail=trim(email.value);
  if(mail=="") return;
  var em;
  var myReg = /^[_a-z0-9]+@([_a-z0-9]+\.)+[a-z0-9]{2,3}$/;
  if(separator==null){
    if(myReg.test(email.value)==false){
      alert(alt);
      email.focus();
      return false;
    }
  }
  else{
    em=email.value.split(separator);
    for(i=0;i<em.length;i++){
      em[i]=em[i].trim();
      if(em[i].length>0&&myReg.test(em[i])==false){
        alert(alt);
        email.focus();
        return false;
      }
    }
  }
  return true;
}
function validateForm(theForm){// 若验证通过则返回true
  var disableList=new Array();
  var field = theForm.elements; // 将表单中的所有元素放入数组
  for(var i = 0; i < field.length; i++){
    var vali=theForm.validate;
 if(vali!=null){
   if(vali.value=="0"){
     var fun=vali.functionName;
  if(fun!=null){
    return eval(fun+"()");
  }
  else{
    return true;
  }
   }
 }

    var empty=false;
    var value=trim(field[i].value);
    if(value.length==0){//是否空值
      empty=true;
    }
    var emptyInfo=field[i].emptyInfo;//空值验证
    if(emptyInfo!=null&&empty==true){
      alert(emptyInfo);
      field[i].focus();
      return false;
    }
    var lengthInfo=field[i].lengthInfo;//最大长度验证
    if(lengthInfo!=null&&getStringLength(value)>field[i].maxLength){
      alert(lengthInfo);
      field[i].focus();
      return false;
    }

    var validatorType=field[i].validatorType;
    if(validatorType!=null){//其它javascript
      var rs=true;
      if(validatorType=="javascript"){
        eval("rs="+field[i].functionName+"()");
        if(rs==false){
          return false;
        }
        else{
          continue;
        }
      }
      else if(validatorType=="disable"){//提交表单前disable的按钮
        disableList.length++;
        disableList[disableList.length-1]=field[i];
        continue;
      }
      else if(validatorType=="Date"){
        rs=validateDate(theForm.elements(field[i].fieldName),field[i].format,field[i].errorInfo);
      }
      else if(validatorType=="DateGroup"){
        rs=validateDateGroup(theForm.elements(field[i].year),theForm.elements(field[i].month),theForm.elements(field[i].day),field[i].errorInfo);
      }
      else if(validatorType=="Checkbox"){
        rs=validateCheckbox(theForm.elements(field[i].fieldName),field[i].errorInfo);
      }
      else if(validatorType=="Radio"){
        rs=validateRadio(theForm.elements(field[i].fieldName),field[i].errorInfo);
      }
      else if(validatorType=="Select"){
        rs=validateSelect(theForm.elements(field[i].fieldName),field[i].errorInfo);
      }
      else if(validatorType=="Email"){
        rs=validateEmail(theForm.elements(field[i].fieldName),field[i].errorInfo);
      }
      else{
        alert("验证类型不被支持, fieldName: "+field[i].name);
        return false;
      }
      if(rs==false){
        return false;
      }
    }
    else{//一般验证
      if(empty==false){
        var v = field[i].validator; // 获取其validator属性
        if(!v) continue;            // 如果该属性不存在,忽略当前元素
        var reg=new RegExp(v);
        if(reg.test(field[i].value)==false){
          alert(field[i].errorInfo);
          field[i].focus();
          return false;
        }
      }
    }
  }
  for(i=0;i<disableList.length;i++){
    disableList[i].disabled=true;
  }
  return true;
}




function copyCheckboxesRange(the_form, the_name)
{
        
       if (the_name.checked == true) {
           the_name.checked = false;
          } else {
                the_name.checked = true;
            }
          
}