ass="row">
                            <div class="col-md-6">
                                <div class="image-crop">
                                    <img src="../img/a3.jpg">
                                </div>
                            </div>
                            <div class="col-md-6">
                                <h4>图片预览：</h4>
                                <div class="img-preview img-preview-sm"></div>
                                <h4>说明：</h4>
                   