aspx页面：
View Code
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="JsSafeCode._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"> <title></title> <script type="text/javascript"> function reloadcode() { document.getElementById('imgCode').src = 'checkCode.aspx?' + Math.random(); } </script></head><body> <form id="form1" runat="server"> <div> <asp:TextBox ID="txtCode" runat="server" Width="80"></asp:TextBox><img src="checkCode.aspx" id="imgCode" onclick="reloadcode()" alt="点击刷新验证码" style="cursor: pointer" /> <asp:Button ID="btnTest" runat="server" Text=" 验 证 " OnClick="btnTest_Click" /> </div> </form></body></html>