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正则表达式简单使用 

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
    <script type="text/jscript">
      //  document.onkeyup = function (event) {
        function AA(obj) {
            if (!check(obj.value)) {
                alert("不正确");
            }
        }

//小数点后只能输入3位
        function check(c) {
            var r =/^[+-]?[1-9]?[0-9]*\.?\d{0,3}$/;
            return r.test(c);
        }
    </script>

</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="TextBox1" runat="server" onkeyup="AA(this)"></asp:TextBox>
    </div>
    </form>
</body>
</html>

 

posted @ 2016-07-29 11:29  yaro-feng  阅读(133)  评论(0)  编辑  收藏  举报