如何用Postman测试文件或图片上传

<!--图片上传-->
            <div class="row cl">
                <label class="form-label col-xs-4 col-sm-3"><span class="c-red">*</span> 图片:</label>
                <div class="formControls col-xs-8 col-sm-3">
                    <input id="img" type="file" multiple="true" onchange="uploadImgs(this,event)"/>
                    <div id="img_box">
                        <foreach name="img_upload.img_arr" item="data">
                        <div class="img_item">
                            <img id="ImgPr" class="hid" src="{$data.url}"/>
                            <span class="del hid" onclick="closeImg(this)">X</span>
                        </div>
                        </foreach>
                    </div>

                    <input id="hid_img" type="hidden" name="img" value="{$img_upload['img_str']}"/>
                </div>
            </div>
            <!--图片上传-->



// 多图片上传触发事件
        function uploadImgs(_this,event) {
            // 实例FormData
            var data = new FormData();
            for (var i = 0; i < event.target.files.length; i++) {
                var files = event.target.files[i];
                // 批量添加文件
                data.append('file[]', files);
            }
            // 异步提交
            ajaxUpload(data);
        }

        function ajaxUpload(data) {

            $.ajax({
                url: '{$ajax_upload_url}',
                type: "POST",
                data: data,
                dataType: 'json',
                processData: false,// *重要,确认为false
                contentType: false,
                // beforeSend: function () {
                //     console.log(11111);
                // },
                success: function (res) {
                    if(res.error == 1) {
                        alert(res.msg);
                        return;
                    }else {
                        console.log(res);
                        var imgArr = $("#hid_img").val();
                        $.each(res.data,function(index,data) {
                            // 追加显示
                            $("#img_box").append(
                                '<div class="img_item">'+
                                    '<img id="ImgPr" class="hid" src="'+data.path+'"/>'+
                                    '<span class="del hid" onclick="closeImg(this)">X</span>'+
                                '</div>'
                            );
                            if(!imgArr) {
                                imgArr = data.path;
                            }else {
                                imgArr += ","+data.path;
                            }

                            // 追加提交数据
                            //$(".formControls").append('<input id="hid_img" type="hidden" name="img[]" value="'+data.path+'"/>');
                        })
                        $("#hid_img").val(imgArr);
                    }
                },
                error: function (res) {
                    alert('异步上传图片接口出错');
                    return;
                }
            });
        }

 /*
     * 图片上传
     * */
    public function ajaxUpload() {
        $upload = new \Think\Upload();// 实例化上传类
        $upload->maxSize   =     3145728 ;// 设置附件上传大小 3145728
        $upload->exts      =     array('jpg', 'gif', 'png', 'jpeg');// 设置附件上传类型
        $upload->rootPath  =     './Uploads/'; // 设置附件上传根目录
        $upload->savePath  =     'repair/'; // 设置附件上传（子）目录
        // 上传文件
        $info   =   $upload->upload();
        if(!$info) {// 上传错误提示错误信息
            $this->ajaxReturn(array("error"=>1,"msg"=>$upload->getError(),"data"=>array()));
        }else{// 上传成功
            $uploadFile = array();
            foreach($info as $key=>$value) {
                $uploadFile[] = array(
                    "path" => ltrim($upload->rootPath,'.').$value['savepath'].$value['savename'],
                    "ext" => $value['ext'],
                );
            }

            $this->ajaxReturn(array("error"=>0,"msg"=>"上传成功","data"=>$uploadFile));
        }
    }