pe="button">放大</button>
                                    <button class="btn btn-white" id="zoomOut" type="button">缩小</button>
                                    <button class="btn btn-white" id="rotateLeft" type="button">左旋转</button>
                                    <button class="btn btn-white" id="rotateRight" type="button">右旋转</button>
                                    <button class="btn btn-warning" id="setDrag" type="button">裁剪</button>
                                <