页面代码:
<script type="text/javascript">
      function ReceiveServerData(rValue)
      {
         alert(rValue);
      }
 </script>
<input id="Button1" type="button" value="button" onclick ="CallServer('Client')" />
服务端代码:
public partial class back2 : System.Web.UI.Page,System .Web .UI .ICallbackEventHandler
{
    public string CallBackValue = null;
    protected void Page_Load(object sender, EventArgs e)
    {

    }
     // 注册脚本到前台页面
    protected void Page_PreRender(object sender, EventArgs e)
    {
        RegClientScript();
    }
    // javascript函数(服务器端事件的客户端回调)
    protected void RegClientScript()
    {
       ClientScriptManager cs = Page.ClientScript;
       string jstxt=@"
                  function CallServer(msgid)
                  {
                     " + cs.GetCallbackEventReference(this, "msgid", "ReceiveServerData", null) + @";
                  }";
       cs.Register

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