Variables
ARROW_CURSOR_NAME
ARROW_CURSOR_NAME: "arrow" = 'arrow'
CROSSHAIR_CURSOR_NAME
CROSSHAIR_CURSOR_NAME: "crosshair" = 'crosshair'
ERASER_CURSOR_NAME
ERASER_CURSOR_NAME: "eraser" = 'eraser'
LASER_PEN_CURSOR_NAME
LASER_PEN_CURSOR_NAME: "laser-pen" = 'laser-pen'
PENCIL_CURSOR_NAME
PENCIL_CURSOR_NAME: "pencil" = 'pencil'
TEXT_CURSOR_NAME
TEXT_CURSOR_NAME: "text" = 'text'
箭头光标名称