js只能输入数字

<script type="text/javascript" language="javascript">
  function regInput(obj, reg, inputStr)
    {
     var docSel = document.selection.createRange()
     if (docSel.parentElement().tagName != "INPUT") return false
     oSel = docSel.duplicate()
     oSel.text = ""
     var srcRange = obj.createTextRange()
     oSel.setEndPoint("StartToStart", srcRange)
     var str = oSel.text + inputStr + srcRange.text.substr(oSel.text.length)
     return reg.test(str)
    }
</script>

 

<tr>
   <td>artistDisplayName  </td>
   <td><input type="text" name="DisplayName" onkeypress="return regInput(this,/^[0-9]*$/,String.fromCharCode(event.keyCode))"  onpaste="return regInput(this,/^[0-9]*$/,window.clipboardData.getData('Text'))" ondrop="return regInput(this,/^[0-9]*$/,event.dataTransfer.getData('Text'))"/></td>
  </tr>