定义鼠标样式
cursor:pointer;
取值: [ [<uri> ,]* [ auto | crosshair | default | pointer | move | e-resize | ne-resize | nw-resize | n-resize | se-resize | sw-resize | s-resize | w-resize | text | wait | help | progress ] ] | inherit
[<uri> ,]*: 根据用户定义的资源显示
auto: 正常鼠标
crosshair: 十字鼠标
default: 默认鼠标
pointer: 点状鼠标
move: 移动鼠标
e-resize,ne-resize,nw-resize,n-resize,se-resize,sw-resize,s-resize,w-resize: 改变大小鼠标
text: 文字鼠标
wait: 等待鼠标
help: 求助鼠标
progress: 过程鼠标
inherit: 继承
