CSS cursor 滑鼠游標設定
滑鼠游標在設計上扮演一個很重要的功能，必須暗示使用者可以進行的操作。CSS 中 cursor 這個屬性用來決定滑鼠移到上面時會怎麼顯示，實際去查了發現滑鼠游標的屬性居然有 20 種左右！
滑鼠游標設定 style="cursor:pointer;" 或 css aa{cursor:pointer}
cursor:auto
cursor:cell
cursor:context-menu
cursor:col-resize
cursor:copy
cursor:crosshair
cursor:default
cursor:e-resize
cursor:ew-resize
cursor:grab
cursor:grabbing
cursor:help
cursor:move
cursor:n-resize
cursor:ne-resize
cursor:nesw-resize
cursor:ns-resize
cursor:nw-resize
cursor:nwse-resize
cursor:no-drop
cursor:none
cursor:not-allowed
cursor:pointer
cursor:progress
cursor:row-resize
cursor:s-resize
cursor:se-resize
cursor:sw-resize
cursor:text
cursor:url()
cursor:vertical-text
cursor:w-resize
cursor:wait
cursor:zoom-in
cursor:zoom-out
cursor:initial