文本框输入限定数字或小数

<input id="amount" style="IME-MODE: disabled; WIDTH: 60px; HEIGHT: 15px"
 onkeyup="this.value=this.value.replace(/\D/g,'')"  
onafterpaste="this.value=this.value.replace(/\D/g,'')" 
maxlength="5" size="14" name="amount" type="text" />


<input onpaste="return false" id="amount" 
style="IME-MODE: disabled; WIDTH: 60px; HEIGHT: 15px" 
onpropertychange="if(isNaN(value)) value=value.substring(0,value.length-1);"

 maxlength="5" size="14" name="amount" />