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 = 0;
           
            var filePath = target.value;
           
            var fileSystem = new ActiveXObject("Scripting.FileSystemObject");
            var file = fileSystem.GetFile(filePath);
            fileSize = file.Size;
          
            
            var size = fileSize / 1024;
            if (size > 10000) {
                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 - 1]);
            } else {
                document.getElementById('Label10').innerHTML = size+"KB";

                $("#Label11").html(showDate());
                $("#LinkButton2").html(arr[arr.length - 1]);
            }

        }
</script>

<tr id="trrow6"  runat="server">
            <td colspan="4" style="background-color: #C0C0C0">
                <asp:Label runat="server" Text="上传附件" Width="301px"></asp:Label>
            </td>
        </tr>
         
        <tr>
            <td class="left" style=" 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=" 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>