$("#input_file_molding").change(function () {                
                $("#UBB_picture").hide();
                $.ajax({
                    type: "POST",
                    url: "../Tools/uploadPicture.aspx",
                    data: { upfile: $("#input_file_molding").val() },
                    success: function (result) {
                        if (result == "1") {
                            $("#picture_loading").hide();
                            $("#picture_load").show();
                        }
                        //alert(result);
                    }
                });

        <form id="upimgform" method="post" enctype="multipart/form-data" action="upaimg.php"> 
        上传图片：
        <span class="uimg1"><span id="maolian" class="sc">本地上传</span>
            <span class="uimg2"><input name="uimg" id="uimg" type="file" size="1" style="width:100%" /></span>
        </span>
        <input type="submit" value="submit" />
        </form>