学习JS的好帮手，可以作为手册使用，对于作JS的同学非常有帮助。-Learning JS is a good helper, you can use as a handbook for the students to make JS very helpful.

w3c 官方版本的html速查手册，pdf打印版本，编写html文档必备。-W3C official version of the HTML Handbook, PDF Print version, write HTML documents required.