Javascript控制文本框只能输入数字

<input onkeypress="return event.keyCode>=48&&event.keyCode<=57||event.keyCode==46" onpaste="return !clipboardData.getData('text').match(//D/)" ondragenter="return false" style="ime-mode:Disabled" >

http://qhd-liwei.javaeye.com/blog/421253