30 seconds of code
https://www.30secondsofcode.org/

You-need-to-know-css
https://lhammer.cn/You-need-to-know-css/#/zh-cn/mouse-cursor

ip33.com
http://www.ip33.com/

Unicode编码解码
http://www.ip33.com/unicode.html

URL Encode/Decode
http://www.ip33.com/urlencode.html

Unix时间戳转换
http://www.ip33.com/timestamp.html