JS代码判断集锦之一 - 站长论坛

<script language="JavaScript">
function checkid(iden,year,month,day){

if (iden.value.length==15) {


   if ((iden.value.lastIndexOf(month.value+day.value))==8) {

      return true;
   }
   return false;
}
if (iden.value.length==18) {


   if ((iden.value.indexOf(year.value+month.value+day.value))==6) {

      return true;
   }
   return false;
}

return false;
}

function isCharsInBag (s, bag)
{
  var i;
  for (i = 0; i < s.length; i++)
  {
   var c = s.charAt(i);
   if (bag.indexOf(c) == -1) return false;
  }
  return true;
}
function isEmpty(s)
{
      return ((s == null) || (s.length == 0))
}

function isWhitespace (s)
{
  var whitespace = " \t\n\r";
  var i;
for (i = 0; i < s.length; i++)
{
   var c = s.charAt(i);
   if (whitespace.indexOf(c) >= 0)
         {
               return true;
         }
}
return false;
}
function isEmail (s,t)
{
if (isEmpty(s))
      {
            window.alert("输入的E-mail地址不能为空，请输入！");
      mobj = eval(t);
      mobj.focus();
      mobj.select();
            return false
      }
if (isWhitespace(s))
      {
            window.alert("输入的E-mail地址中不能包含空格符，请重新输入！");
      mobj = eval(t)
      mobj.focus()
      mobj.select()
            return false;
      }
var i = 1;
var len = s.length;

      if (len > 50)
      {
            window.alert("email地址长度不能超过50位!");
      mobj = eval(t)
      mobj.focus()
      mobj.select()
            return false;
      }

      pos1 = s.indexOf("@");
      pos2 = s.indexOf(".");
      pos3 = s.lastIndexOf("@");
      pos4 = s.lastIndexOf(".");
      if ((pos1 <= 0)||(pos1 == len)||(pos2 <= 0)||(pos2 == len))
      {
            window.alert("请输入有效的E-mail地址！");
      mobj = eval(t)
      mobj.focus()
      mobj.select()
            return false;
      }
      else
      {
            if( (pos1 == pos2 - 1) || (pos1 == pos2 + 1)
               || ( pos1 != pos3 )
               || ( pos4 < pos3 ) )
            {
                     window.alert("请输入有效的E-mail地址！");
      mobj = eval(t)
  mobj.focus()
  mobj.select()
                     return false;
            }
      }

      if ( !isCharsInBag( s, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789.-_@"))
      {
            window.alert("email地址中只能包含字符ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789.-_@\n" + "请重新输入" );
      mobj = eval(t)
      mobj.focus()
            return false;
      }
            return true;
}
function isnumber(str){
      var digits="1234567890";
      var i=0;
      var strlen=str.length;
      while((i<strlen)){
            var char=str.charAt(i);
            if(digits.indexOf(char)==-1)return false;i++;
                                    }
      return true;
}
function isnumbercode(str){
      var digits="1234567890-/";
      var i=0;
      var strlen=str.length;
      while((i<strlen)){
            var char=str.charAt(i);
            if(digits.indexOf(char)==-1)return false;i++;
                                    }
      return true;
}
</script>

<script language=javascript>
function checkForm(theform){
  if (document.frm.companyname.value.length==0){
   alert("单位名称不能为空。");
   mobj = eval("document.frm.companyname");
      mobj.focus()
      mobj.select()
      return false;
}

if (document.frm.address.value.length==0){
   alert("单位地址不能为空");
   mobj = eval("document.frm.address");
      mobj.focus()
      mobj.select()
      return false;
}

   if (document.frm.invest.value.length==0){
   alert("投资额不能为空");
   mobj = eval("document.frm.invest");
      mobj.focus()
      mobj.select()
      return false;
}
if (document.frm.codeornumber.value.length==0){
   alert("法人代码证书号或营业执照编号不能为空");
   mobj = eval("document.frm.codeornumber");
      mobj.focus()
      mobj.select()
      return false;
}

if (document.frm.linkman.value.length==0){
   alert("联系人不能为空");
   mobj = eval("document.frm.linkman");
      mobj.focus()
      mobj.select()
      return false;
}
if (document.frm.linkmanjob.value.length==0){
   alert("联系人职位不能为空");
   mobj = eval("document.frm.linkmanjob");
      mobj.focus()
      mobj.select()
      return false;
}
if (document.frm.phone.value.length==0){
   alert("电话不能为空");
   mobj = eval("document.frm.phone");
      mobj.focus()
      mobj.select()
      return false;
}

         if (document.frm.email.value=='') {
            window.alert ("请输入您的E-mail地址！")
            mobj = eval("document.frm.email");
      mobj.focus()
      mobj.select()
            return false
      }
      if ( !isEmail(document.frm.email.value,document.frm.email) )
         return false
      if (document.frm.introduction.value.length==0){
   alert("公司简介不能为空");
   mobj = eval("document.frm.introduction");
      mobj.focus()
      mobj.select()
      return false;
}
      if (document.frm.positionname.value.length==0){
   alert("职位名称不能为空");
   mobj = eval("document.frm.positionname");
      mobj.focus()
      mobj.select()
      return false;
}
if (document.frm.jobaddress.value.length==0){
   alert("工作地点不能为空");
   mobj = eval("document.frm.jobaddress");
      mobj.focus()
      mobj.select()
      return false;
}
   if (document.frm.jobfunction.value.length==0){
   alert("工作职责不能为空");
   mobj = eval("document.frm.jobfunction");
      mobj.focus()
      mobj.select()
      return false;
}
if (document.frm.positionrequre.value.length==0){
   alert("职位要求不能为空");
   mobj = eval("document.frm.positionrequre");
      mobj.focus()
      mobj.select()
      return false;
}
if (document.frm.salary.value.length==0){
   alert("待遇不能为空");
   mobj = eval("document.frm.salary");
      mobj.focus()
      mobj.select()
      return false;
}
  }
</script>