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ASP.NET与JavaSrcipt交互问题

1.如何在JavaScript访问C#函数?
方法一:1、首先建立一个按钮,在后台将调用或处理的内容写入button_click中;
          2、在前台写一个js函数,内容为document.getElementById("btn1").click();
          3、在前台或后台调用js函数,激发click事件,等于访问后台c#函数;
方法二:1、函数声明为public              
             后台代码(把public改成protected也可以)
             public string ss()
             {
                return("a");
             }
          2、在html里用<%=fucntion()%>可以调用
             前台脚本
             <script language=javascript>
             var a = "<%=ss()%>";
             alert(a);
             </script>
方法三:1、<script language="javascript">
             <!--
             function __doPostBack(eventTarget, eventArgument)
             {
                var theForm = document.Form1;       //指runat=server的for


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