Classroom is the main position of school education. According to the view of constructivism, in classroom teaching, teachers are not only the disseminators of knowledge, the lecturers in the classroom, the guides of learning, but also the collaborators and helpers of students. Teachers should use certain media to present and convey teaching contents and information to students, and even organize teaching activities. Traditional classroom teaching is mainly carried out with the help of blackboard and chalk. Although teachers can give full play to the leading role and teachers and students can interact in time, the teaching content cannot be copied and reused because of the single technical means and the serious limitation of teaching resources. [1] With the development of society and the emergence of various information technology means, people increasingly need to display colorful digital media materials in school classrooms. Multimedia classrooms do have many advantages and functions that traditional media do not have, such as displaying various digital media materials, enriching students' perception, fully demonstrating complex and dynamic processes, having a large amount of information, vivid sound and pictures, and bright colors, which can well stimulate students' interest in learning. However, there are some shortcomings in multimedia classroom teaching.

First of all, there is a lack of interactive control, that is, teachers can't have any control over the content projected on the big screen when teaching in front of the screen, and they can only teach in the order of courseware made in advance. Teachers play the role of projectionist most of the time, and can't explain, mark and write on the blackboard in class like traditional teaching process, especially for subjects that need a lot of reasoning, such as mathematics. Moreover, the leading role of teachers is not satisfactory, and the large-capacity demonstration content projected on the big screen increases the burden of students taking notes. Many students are too busy taking notes to think, and there is a lack of good communication between teachers and students.

Secondly, it is not easy to make classroom teaching courseware because of the imperfect construction of teaching resource database. Most of the courseware used by teachers in multimedia classrooms are made by themselves. It will take them a long time to make these courseware. Due to the limitation of teachers' computer skills, the courseware they made can't meet the needs of the classroom and can't effectively combine information technology with courses. For courseware makers, in addition to mastering a lot of computer professional knowledge, they also need to master professional knowledge related to courseware, which is obviously a great burden for teachers. Most of the courseware developed are PowerPoint courseware for classroom demonstration, which can not well reflect the hierarchy, structure and interaction of the course, and it is difficult to give full play to the advantages of multimedia classroom teaching. Therefore, information-based teaching not only needs to introduce and present digital information resources conveniently, but also needs to increase or decrease the content at any time as needed; A new type of teaching equipment can not only give full play to the leading role and personal charm of teachers, but also enhance the participation and interaction between teachers and students. The appearance of interactive electronic whiteboard brings hope for the realization of this goal.

Second, the application advantages of interactive electronic whiteboard in classroom teaching

Interactive whiteboard is a high-tech product made of cutting-edge electronic technology, software technology and other advanced technologies and brand-new materials. It mainly applies the principles of electromagnetic induction and ultrasonic wave, and combines computers and projectors to realize paperless office and teaching. The rich library and courseware resources of interactive electronic whiteboard create an interesting and fascinating classroom atmosphere, create a real, novel and dynamic teaching environment, and solve the technical limitations of teachers in the teaching process, thus improving and optimizing the teaching quality.

(A) advantages of teachers' teaching

1. present dynamic teaching information and generate high-quality teaching courseware. For teachers, the traditional multimedia courseware is more about demonstration function, and there is little two-way communication between teachers and students in the teaching process, so students can't participate in the courseware demonstration process because the content of the courseware can't be changed. The "courseware" made by whiteboard technology opens the annotation function in the application software or operation interface, annotates the original document and explains it in detail. According to the needs of explanation, the teacher can pick up the electronic induction pen and write directly on the whiteboard at any time, and can erase the unnecessary content on the whiteboard like a general blackboard without suffering health damage caused by dust. At the same time, teachers can freely apply information technology to teaching in class, and save or print the contents written on the whiteboard for further modification, improvement and communication. In this way, teachers will have more opportunities to share and reuse resources and materials, so as to generate a personalized "courseware" for every teacher in each class-specifically, it is a digital record of the whole teaching process, which provides great convenience for the interaction and participation of teachers and students in the teaching process, reduces the workload and saves the time for preparing lessons.

2. It is convenient to implement the teaching process flexibly and efficiently. Interactive whiteboard makes the whole teaching process more flexible and efficient. Compared with ordinary whiteboard, it adds many practical functions, which are not available in general multimedia classroom teaching. ① As an electronic teaching tool. The interactive whiteboard comes with some electronic symbols of commonly used teaching AIDS, such as rulers and protractors commonly used in mathematics teaching. These electronic tools can be conveniently used in the teaching process of drawing, measuring, angle and sector knowledge. ② Local amplification function. Because the general blackboard, screen and whiteboard are not particularly large, if you want the whole class to clearly see the teaching information on the whiteboard, you only need to touch the inductive pen on the interactive electronic whiteboard at will, and this part of the content will be enlarged. ③ Playback function. Using the playback function of the interactive whiteboard system, the previous operation process can be played back any number of times to realize efficient and orderly review. ④ Searchlight function. Using the searchlight function of interactive whiteboard system, the key and difficult points can be highlighted, especially for primary and secondary school students, which can effectively stimulate their interest. ⑤ Editing and annotation functions. For the courseware that has been made, teachers can control and annotate the original courseware in whiteboard annotation mode, and even mark some video files for detailed explanation, so as to better guide students to grasp the key points.

3. Seamless use of digital information resources. Interactive whiteboard can seamlessly use some digital information resources, including websites, video and audio clips, interactive teaching programs, interactive software for digital flip charts, electron microscopes or digital cameras, scanners and so on. It makes the presentation of digital resources more flexible, and also solves the problem that the structure of teaching materials using courseware and slides is highly solidified in the past multimedia projection system environment.

4. Pay attention to the network and avoid "local restrictions". In the design of interactive whiteboard courseware, "network thinking" should run through. The design of courseware should not be limited to the teaching content of a certain class, but should put forward higher and extensible requirements for students in the courseware, provide more relevant learning information for students, and let students learn and explore independently. And this information, we can put it on the local area network for students to search for themselves, and we can also provide a website for students to query online. In this way, students actively participate in learning. Under the guidance of teachers, students use interactive electronic whiteboard and computer network to have curiosity and questions about the questions raised in their study. After studying and solving the problems assiduously, they show their self-confidence and thirst for knowledge, and their love for truth is satisfied.

(B) advantages of students' learning

1. Improve students' attention and understanding. Traditional single-color blackboard teaching has been replaced by multi-functional interactive electronic whiteboard teaching with colorful and rich media forms, which can make students shine at the moment, greatly attract their attention, and use the theory of multiple intelligences to help students better understand and master knowledge. Especially when learning some abstract knowledge and concepts, whiteboard provides students with a variety of methods and ideas to analyze and solve problems.

2. Improve students' classroom learning efficiency. In the whole teaching process, students can change and enrich the original "courseware" content of teachers at any time according to their own ideas. Whether students correctly understand knowledge or correct wrong answers in time, as long as they operate on the whiteboard, the whiteboard system will automatically store these valuable materials. Because it can be saved and printed, students only need to concentrate on lectures and do not need to take notes. After class, they can directly save the classroom teaching materials for review, which greatly improves the efficiency of listening and learning.

3. It is beneficial to arouse students' enthusiasm and participation in active learning in class. Interactive whiteboard, which emphasizes the interaction between teachers and students, enlivens the boring classroom, greatly reduces the phenomenon of students' inattention, small gestures and casual talk in the original classroom teaching, and mobilizes the enthusiasm of students to participate in classroom activities, thus improving the learning quality, learning motivation and learning self-confidence. The teaching of interactive whiteboard helps teachers to collect all kinds of learning resources, meet the specific needs of students with different learning styles, truly teach students in accordance with their aptitude, help students participate in interactive activities between teachers and students, have more opportunities to participate in collaborative learning, improve students' personal skills and interpersonal skills, and increase their learning confidence. [2]

4. Record at any time to promote reflection. Reflection is one of the key abilities of students' autonomous learning and lifelong learning. This kind of internalization ability is difficult to cultivate, and teachers often have no way to start. If we can reproduce students' academic achievements, guide students to observe and compare, or link teaching contents with achievements in different periods, or compare achievements in stages, it will help students reflect on their academic achievements. The "screen capture" of interactive electronic whiteboard can save all the contents displayed on the board in the form of pictures, so that students' learning achievements can be recorded immediately and saved for a long time. On the one hand, students who keep their grades can enjoy the pleasure of success and the satisfaction of being valued; On the one hand, it can be used repeatedly in class summary or subsequent classes, which can promote students to re-examine their learning achievements, facilitate cross-class communication, and guide students to broaden their thinking in learning and learning. In addition, the "video recorder" of the interactive electronic whiteboard can record all the operation processes on the board, and the files will be saved in AVI format, which provides cognitive tools for teachers and students to record the activity process. Learners can use them to acquire, analyze, process, edit and produce information and resources, and can use them to express their thoughts and communicate and cooperate with others.

Three. Concluding remarks

In a word, all advanced teaching tools serve education and teaching. Only from the development of students and the reality of teaching can we realize the perfect combination of information technology and teaching art! As paul clark, a famous media technology expert, said, "It is the instructional design that determines learners' learning, not the media used to deliver teaching", and the application of interactive whiteboard is no exception. [3] Interactive whiteboard is a powerful classroom teaching tool, from which both teachers and students can benefit. It can effectively use all kinds of resources, enhance the demonstration effect, improve the quality of teacher-student interaction, bring infinite vitality to our middle school classroom, make classroom teaching more colorful, promote the formation of new teaching models, fully cultivate students' creative thinking, mobilize students' learning enthusiasm, and thus significantly improve the teaching effect. With the continuous development, perfection, popularization and application of this technology, it will certainly promote the further development of the integration of modern information technology and classroom teaching.