js限制文本框的输入内容代码分享（3类）

<style type="text/css">
<!--
.STYLE1 {
 color: #0099FF;
 font-weight: bold;
 font-size: x-large;
}
-->
</style>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p align="center" class="STYLE1">亲，试试效果吧！</p>
<p align="center"><strong>请输入数字或字母</strong>
 <input onkeyup="value=value.replace(/[\W]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">
</p>
<p align="center"><strong>请输入数字，只能输入数字哦</strong>
 <input onkeyup="value=value.replace(/[^\d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">
</p>
<p align="center"><strong>请输入汉字，只能输入汉字哦</strong>
 <input onkeyup="value=value.replace(/[^\u4E00-\u9FA5]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\u4E00-\u9FA5]/g,''))">
</p>

<input onKeyPress="if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46 || //./d/d$/.test(value))event.returnValue=false">

<input onkeyup="this.value=this.value.replace(//D/g,'')" onafterpaste="this.value=this.value.replace(//D/g,'')">