tion>
                        <option value="base64">Base64无换行</option>
                    </select>
                </div>
                <button class="btn btn-dim btn-outline-secondary btn-block card-link mb-3" @click="check">
                    验证
                </button>
            </div>
            <div class="tab-pane" id="tabItem1" :class="{'active':show===4}">
                <div class="form-group">
                    <label class="form-label">导出方式</label>
     