<form name="form1"  >
  <input name="text1" type="text" id="text1" size="10">
  <input type="submit" name="Submit" onClick="num()" >
</form>
<script language="javascript">
 function num()
 {    var flag1=false;
      var compStr="4567839012";
      var a=from1.text1.value;
      var length2=a.length;
      for (var iIndex=0;iIndex<length2;iIndex++)
   {    var temp1=compStr.indexOf(a.charAt(iIndex));
  if(temp1==-1)
  { flag1=false;
   alert("不对") ;
   break;      
  } else
  {flag1=true;} } return flag1; }
</script>