asp.net 用jquery判断fileupload上传文件的大小和类型和名字

 <script language="javascript" type="text/javascript">
     //检查上传文件大小和获取文件名
         function fileChange(target) {

             var fileSize = ;

             var filePath = target.value;

             var fileSystem = new ActiveXObject("Scripting.FileSystemObject");
             var file = fileSystem.GetFile(filePath);
             fileSize = file.Size;

             var size = fileSize / ;
             if (size > ) {
                 alert("附件不能大于10M");
             }
             var arr = filePath.split("\\");
             if (target.id == "FileUpload1") {
                 document.getElementById('Label8').innerHTML = size+"KB";

                 $("#Label9").html(showDate()); LinkButton1
                 $("#LinkButton1").html(arr[arr.length - ]);
             } else {
                 document.getElementById('Label10').innerHTML = size+"KB";

                 $("#Label11").html(showDate());
                 $("#LinkButton2").html(arr[arr.length - ]);
             }

         }
 </script>

 <tr id="trrow6"  runat="server">
             <td colspan="" style="background-color: #C0C0C0">
                 <asp:Label runat="server" Text="上传附件" Width="301px"></asp:Label>
             </td>
         </tr>

         <tr>
             <td class="left" style="width: 167px">
                 附件1：
             </td>
             <td>
                 <asp:FileUpload ID="FileUpload1" onchange="fileChange(this)" runat="server" Width="181px" style="display:none"/>
                  <input id="Button3" type="button" value="上传附件" onclick="document.getElementById('FileUpload1').click();" />

                <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="false" CommandName="download"
                         Text='' onclick="LinkButton1_Click"></asp:LinkButton>
                 <asp:Label ID="Label14" runat="server" Text="" Visible="false"></asp:Label>
             </td>
             <td><asp:Label ID="Label8" runat="server" ></asp:Label></td>
             <td><asp:Label ID="Label9" runat="server" ></asp:Label></td>
            </tr>
             <tr>
             <td class="left" style="width: 167px">
                 附件2：
             </td>
             <td >

                 <asp:FileUpload ID="FileUpload2" runat="server"
                     onchange="fileChange(this)" Width="179px"
                     style="display:none"
                      />
                  <input id="Button2" type="button" value="上传附件"  onclick="document.getElementById('FileUpload2').click();" />
                <asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="false" CommandName="download"
                         Text='' onclick="LinkButton1_Click"></asp:LinkButton>
                 <asp:Label ID="Label26" runat="server" Text="" Visible="true"></asp:Label>
                 <a title="test" ></a>
             </td>
             <td><asp:Label ID="Label10" runat="server"  ></asp:Label></td>
             <td><asp:Label ID="Label11" runat="server" ></asp:Label></td>
         </tr>