layui文件上传组件配合后台代码进行文件上传

html部分代码

                        <div style="margin-left: 110px;text-align: center;" class="layui-upload">
                            <input type="hidden" name="head[0]" lay-verify="head" id="head" value=""> //这里是文件上传字段对应的name值，
                            完成上传之后，要把返回的id赋值给value
                            <button type="button" class="layui-btn" id="upload">
                                <i class="layui-icon">&#xe608;</i> 文件上传
                            </button>
                            <div class="layui-upload-list">
                                <img style="width: 140px; height: 180px; border: 0.5px solid " class="layui-upload-img" id="imgUpload">
                                <p id="demoText"></p>
                            </div>
                        </div>

js部分代码

layui.use('upload', function(){
                var $ = layui.jquery
                    ,upload = layui.upload;
                var uploadInst = upload.render({
                    elem: '#upload'+n,
                    url: '/admin.php?s=census&c=home&m=upload',
                    field: "file_data",
                    data: {
                        file_data: function(){
                            return $('#upload'+n).val();
                        },
                {csrf_token()} : "{csrf_hash()}"
            },
                before: function(obj){
                    //预读本地文件示例，不支持ie8
                    obj.preview(function(index, file, result){
                        $('#imgUpload'+n).attr('src', result); //图片链接（base64）
                    });
                },
                done: function(res){
                    if (!res.id){
                        return layer.msg('<span style="color: #fff">'+res.msg+'</span>');
                    }else {
                        if(res.code == 1){
                            $("#head"+n).attr("value", res.id);  //这里是上传完成之后，将文件返回的id赋值给了head字段对应的表单的value
                            return layer.msg('<span style="color: #fff">上传成功</span>');
                        }else{
                            return layer.msg('<span style="color: #fff">上传失败，请重试！</span>');
                        }
                    }
                },
                error: function(){
                    //请求异常回调
                }
            });

php部分代码

public function upload() {
        $files = $this->request->getFiles();
        $p['exts'] = $files['file_data']->getClientExtension();
        $p['size'] = 100;

        // 验证上传权限
        $rt = \Phpcmf\Service::L('upload')->upload_file([
            'path' => '',
            'form_name' => 'file_data',
            'file_exts' => @explode(',', $p['exts']),
            'file_size' => (int)$p['size'] * 1024 * 1024,
            'attachment' => \Phpcmf\Service::M('Attachment')->get_attach_info(),
        ]);
        if (!$rt['code']) {
            exit(dr_array2string($rt));
        }

        // 附件归档
        $data = \Phpcmf\Service::M('Attachment')->save_data($rt['data']);
        if (!$data['code']) {
            exit(dr_array2string($data));
        }

        // 上传成功
        if (IS_API_HTTP) {
            $data['data'] = [
                'id' => $data['code'],
                'url' => $rt['data']['url'],
            ];
            exit(dr_array2string($data));
        } else {
            exit(dr_array2string(['code' => 1, 'msg' => dr_lang('上传成功'), 'id' => $data['code'], 'info' => $rt['data']]));
        }

    }