PrintScreen(mac)

直接在桌面存個png檔
 * 1) Command + Shift + 3 Capture Whole Screen
 * 2) Command + Shift + 4 Capture Part of Screen
 * 3) Command + Shift + 4 and press Space Bar Capture Objects (Icon, Dock, Menu, Submenu, etc)

擷取在剪貼簿裡
 * 1) Command + Shift + Control + 3 Capture Whole Screen
 * 2) Command + Shift + Control + 4 Capture Part of Screen
 * 3) Command + Shift + Control + 4 and press Space Bar Capture Objects