<div>
        <asp:TextBox ID="txtPath" runat="server"></asp:TextBox>
        <asp:FileUpload ID="fileUp" runat="server" onchange="showPath()" />
    </div>

    <script type="text/javascript">
        function showPath() {
            var file = document.getElementById('<%=fileUp.ClientID %>');
            document.getElementById('txtPath').value = file.value;
        }
    </script>

------解决方案--------------------
 <script type="text/javascript">
          function  getFilePath()
          {
             document.getElementById("fileFast").select();  //选中FileUpload控件中的文本      
             var path = document.selection.createRange().text;  //获取当前文本选中的文本document.selection.empty();
             document.getElementById('<%=TextBox1.ClientID%>').value=path;
          }


    

      </script>


  <input type="file" id="fileFast" runat="server"/>
<input type="button" id="ibtnFast" value ="复制地址" onclick="getFilePath()" />

------解决方案--------------------
探讨

HTML code

    <div>
        <asp:TextBox ID="txtPath" runat="server"></asp:TextBox>
        <asp:FileUpload ID="fileUp" runat="server" onchange="showPath()" />
    </div>

    <script type="te……