只能输入数字的文本框：

<script>
function JHshNumberText()
{
 if ( !(((window.event.keyCode >= 48) && (window.event.keyCode <= 57))
  || (window.event.keyCode == 13) || (window.event.keyCode == 46)
  || (window.event.keyCode == 45)))
  {
   window.event.keyCode = 0 ;
  }
} 
</script> 

只能输入汉字的文本框：

 <SCRIPT language="javascript">
 function onlychinese()
   {
    if ((window.event.keyCode >=32) && (window.event.keyCode <= 126))
    {
     window.event.keyCode = 0 ;
    }
   }
 </SCRIPT>

只能输入0-9和T-Z之间的字符的输入框

<script>
function JHshNumberText()
{
 if ( !(((window.event.keyCode >= 48) && (window.event.keyCode <= 57))
  || (window.event.keyCode == 13) || (window.event.keyCode == 46)
  || (window.event.keyCode == 45) || ((window.event.keyCode >= 84)
  && (window.event.keyCode <= 90))))
  {
   window.event.keyCode = 0 ;
   alert("请输入0-9和T-Z之间的字符。。。");
  }
} 
</script>

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