直接上代码

       <div class="form-group">
               <label class="col-sm-2 control-label">教师</label>
                          <div class="col-sm-10">
                           <select style="display:block;
                                    width:100%;
                                    height:34px;
                                    padding:6px 12px;
                                    font-size:14px;
                                    line-height:1.4;
                                    border-radius:4px;
                                    border:1px solid #ccc;
                                    color:#555; "
                                    ng-model="editCourse.TeacherName"
                                    ng-options="Teacher.UserName for Teacher in TeacherList" required>
                                <option value="">选择教师</option>
                              </select>
                          </div>
           </div>

AngularJS

        //data为课程的编号ID
      $scope.Edit = function (data) {
            //通过课程ID获取课程对象
            CourseService.getByCourseID(data).then(function (result) {
                $scope.editCourse = result.data;
                //默认值设定
                //先通过课程里面的教师ID获取教师对象
                CourseService.GetTeacherByTeacherID(result.data.TeacherID).then(function (result) {
                  //$scope.TeacherList为所有教师的列表
                    for (i = 0; i < $scope.TeacherList.length; i++) {
                        //如果当前课程教师的ID与当前遍历到的教师的ID相等的话就把当前遍历到的这个教师的对象给到 ng-model="editCourse.TeacherName"
                        if (result.data.UserID == $scope.TeacherList[i].UserID) {
                            $scope.editCourse.TeacherName = $scope.TeacherList[i];
                        }
                    }
                });
                angular.element("#edit").modal({
                    show: true
                })
            })
        }

演示

谢谢O(∩_∩)O~