可继承:

    1. font-family
    2. font-size
    3. line-height
    4. color
    5. visibility
    6. cursor

    不可继承:

    1. margin、padding、border
    2. width、height、max、min
    3. background
    4. z-index
    5. display
    6. text-shadow
    7. float
    8. position