learn others

Java单例模式的5种实现方法

https://blog.csdn.net/u011386173/article/details/82454714#comments_12880641

pip 安装 selenium提示需要升级

https://blog.csdn.net/zhaolinlin_/article/details/81116248

git clone下载代码出错(RPC failed； curl 56 OpenSSL SSL_read: Connection was reset, errno 10054)及下载速度慢的问题解决

 

https://blog.csdn.net/u011386173/article/details/108120678