<script>
 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>

小写英文：<xmp style= "display:inline"> </xmp>
<input onkeypress = "return regInput(this, /^[a-z]*$/,  String.fromCharCode(event.keyCode))"
  onpaste  = "return regInput(this, /^[a-z]*$/,  window.clipboardData.getData('Text'))"
  ondrop  = "return regInput(this, /^[a-z]*$/,  event.dataTransfer.getData('Text'))"
  style="ime-mode:Disabled"
><br>

大写英文：<xmp style= "display:inline"> </xmp>
<input onkeypress = "return regInput(this, /^[A-Z]*$/,  String.fromCharCode(event.keyCode))"
  onpaste  = "return regInput(this, /^[A-Z]*$/,  window.clipboardData.getData('Text'))"
  ondrop  = "return regInput(this, /^[A-Z]*$/,  event.dataTransfer.getData('Text'))"
  style="ime-mode:Disabled">
<br>

任意数字：<xmp style="display:inline"> </xmp>
<input 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'))"
  style="ime-mode:Disabled"
><br>

限2位小数：<xmp style="display:inline"> </xmp>
<input onkeypress = "return regInput(this, /^\d*\.?\d{0,2}$/,  String.fromCharCode(event.keyCode))"
  onpaste  = "return regInput(this, /^\d*\.?\d{0,2}$/,  window.clipboardData.getData('Text'))"
  ondrop  = "return regInput(this, /^\d*\.?\d{0,2}$/,  event.dataTransfer.getData('Text'))"
  style="ime-mode:Disabled"
> 如: 123.12<br>

日　  期：<xmp style="display:inline"> </xmp>
<input onkeypress = "return regInput(this, /^\d{1,4}([-\/](\d{1,2}([-\/](\d{1,2})?)?)?)?$/,  String.fromCharCode(event.keyCode))"
  onpaste  = "return regInput(this, /^\d{1,4}([-\/](\d{1,2}([-\/](\d{1,2})?)?)?)?$/,  window.clipboardData.getData('Text'))"
  ondrop  = "return regInput(this, /^\d{1,4}([-\/](\d{1,2}([-\/](\d{1,2})?)?)?)?$/,  event.dataTransfer.getData('Text'))"
  style="ime-mode:Disabled"
> 如: 2002-9-29<br>

任意中文：<xmp style="display:inline"> </xmp>
<input onkeypress = "return regInput(this, /^$/,     String.fromCharCode(event.keyCode))"
  onpaste  = "return regInput(this, /^[\u4E00-\u9FA5]*$/, window.clipboardData.getData('Text'))"
  ondrop  = "return regInput(this, /^[\u4E00-\u9FA5]*$/, event.dataTransfer.getData('Text'))"
><br>

部分英文：<xmp style="display:inline"> </xmp>
<input onkeypress = "return regInput(this, /^[a-e]*$/,  String.fromCharCode(event.keyCode))"
  onpaste  = "return regInput(this, /^[a-e]*$/,  window.clipboardData.getData('Text'))"
  ondrop  = "return regInput(this, /^[a-e]*$/,  event.dataTransfer.getData('Text'))"
  style="ime-mode:Disabled"
> 范围: a,b,c,d,e<br>

部分中文：<xmp style="display:inline"> </xmp>

<script language=javascript>
function checkChinese(oldLength, obj)
{
 var oTR = window.document.selection.createRange()
 var reg = /[^一二三四五六七八九十]/g
 oTR.moveStart("character", -1*(obj.value.length-oldLength))
 oTR.text = oTR.text.replace(reg, "")
}
</script>
<input onkeypress="return false" onkeydown="setTimeout('checkChinese('+this.value.length+','+this.uniqueID+')', 1)"
  onpaste  = "return regInput(this, /^[一二三四五六七八九十]*$/,  window.clipboardData.getData('Text'))"
  ondrop  = "return regInput(this, /^[一二三四五六七八九十]*$/,  event.dataTransfer.getData('Text'))"
> 范围: 一二三四五六七八九十<br>