javascript 生成数字下拉列表，可以接收返回值　CreateOption(str1,str2,str3)

<script language="javascript">
function CreateOption(str1,str2,str3)
{
 var CreateOption="";
 for(var i=str2;i<=str3;i++)
 {
  CreateOption+="<option value=\"";
  if(str1 == i)
  {
   CreateOption+="\" selected>"+i+"</option>";
  }
  else
  {
   CreateOption+="\">"+i+"</option>";
  }
 }
 document.write(CreateOption);
}
</script>

<script language="javascript">CreateOption('100','12','120')</script>

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