首先测试接口发送方式。。。。。注意发送结构！

 后端接收@RequestPart

    @SaCheckPermission("system:records:add")
    @Log(title = "【用药纪录】", businessType = BusinessType.INSERT)
    @RepeatSubmit()
    @PostMapping()
    public R<Void> add( @RequestPart MedicationRecordsBo bo, MultipartFile file) {
        return toAjax(iMedicationRecordsService.insertByBo(bo,file));
    }