favorites ↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓ https://developer.mozilla.org/zh-CN/docs/learn ↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑

webpage check ↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓ https://validator.w3.org/#validate_by_uri ↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑

develop tools https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Third_party_APIs

struts： http://amateras.osdn.jp/cgi-bin/fswiki_en/wiki.cgi?page=StrutsIDE

spring Demo https://gitee.com/oschina/spring-demo

demo http://www.demodashi.com/demo/12947.html

vjpage http://www.vjong.com/html/class1_1.html

coin https://dominicpoi.com/2019/03/30/JAVA-chainBlock-02/

deep https://www.open-open.com/news/?page=3