数字正则表达式

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1、问题背景

输入框中只能输入11个数字，不能输入其他的字符

2、实现源码

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>数字正则表达式</title>    <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><style type="text/css">   #phonenumber{      width: 200px;      font-size: 12px;   }</style>  </head>    <body>     <label>只能输入数字：</label>     <input type="text" onkeydown="value=value.replace(/[^\d]/g,'')"      onkeyup="value=value.replace(/[^\d]/g,'')"     onkeypress="value=value.replace(/[^\d]/g,'')" maxlength="11">  </body></html>

3、实现结果

1 1