This is a tutorial contains something not so difficult about javascript, java, C#, C and C++. Maybe you are or had ever been trapped in these problems. I was also trapped, so I would like to write some tutorials for those who are still stumped. These are what I use: HBuilder8.8.4 Eclipse neon Visual Studio 2017 Professional - only install ASP part, 8G in total. If I use new softwares for further blog pages, I'll update and emphasize them with highlight. * infomation about current version Updated 2019/2/19: "javascript" part is completed. Maybe you will be confused because it seems I forgot to upload some tutorials about the interaction between background and front-end using ajax. * notice Updated 2019/2/19: Sorry for everyone, as for the crazy course design and the Postgraduate examination, I have to pause this blog pages for a short time. Maybe I'll be back later, or maybe I'll update it once a week. However, you may relax because personal blogs are better for job hunting in the future, thus leading me to perfect this blog until there's actually nothing to spare in the blog.