瞬间显示/隐藏 Dock 栏

defaults write com.apple.dock autohide-delay -float 0; defaults write com.apple.dock autohide-time-modifier -int 0;killall Dock

取消瞬间显示/隐藏 Dock 栏

defaults write com.apple.dock autohide-delay -float 0.5; defaults write com.apple.dock autohide-time-modifier -int 0.5 ;killall Dock