2ALLEN I E,SEAMAN J. Grade level: tracking online edu- cation in the United States,2015 [EB/OL]. http://www.on- line|earningsurvey.com.
3ALLEN I E,SEAMAN J. Grade change: tracking online e- ducation in the United States ,2014 [EB/OL]. http://www. onlineleamingsurvey.com. Office of International Information Programs. Okinawa Char- ter on Global Information Society, 2000 [EB/OL]. http :// www.mofa.go.jp.
4ROBLYER M D,DOERING technology into teaching[M]. con, 2012. A H. Integrating educational 6th ed. Boston:Allyn & Ba-.
6US Department of Education. Transforming American edu- cation learning powered by technology[EB/OL], http://tech. ed.gov/netp/.
7SPECTOR M,MERRILL D,MERRIENBORE J V,et al. Handbook of research on education communication and technology[M]. 3rd ed. New Jersey: Lawrence Erlbaum As- sociates, 2008.