是w3cschool 的一个完美克隆，之前只是一个手册版，现在作者将其修改为网页版并修改了多处的bug使界面更加完美，修改它纯属爱好行为。-Is a perfect clone of the w3cschool before just a manual version, the author will modify and modify various parts of the bug to make the interface more perfect for the web version,