保存按钮后边，增加“取消”选项

src/frontend/web/js/my-course/components/teacher-quick-list.vue

@@ -7,6 +7,7 @@
         <div class="d-i-b" v-if="addFormShow">
             <input type="text" class="input-r-control reset-input" placeholder="请输入讲师名称" v-model="newName" v-el:nameInput>
             <button type="button" class="btn btn-nobg" @click="addTeacher">保存</button>
+            <button type="button" class="btn btn-nobg" @click="addFormShow=false">取消</button>
         </div>
         <span class="m-l-10" v-else><a href="javascript:;" @click="showAddForm">+ 添加讲师</a></span>
     </div>