窗口(window)和分区span快速切换
bind-key num
在配置文件中加入`bind-key C-w last-window`就可以通过bind-key Ctrl+w来切换上次和当前的window了
`bind-key C-a last-span`，就可以通过bind-key Ctrl+a来切换上次和和当前的span
A introduce to jenkins ci/cd
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