hover里的transition

div:hover { cursor: pointer; transform: rotate(180deg);

    -webkit-transition-property: transform;

       -moz-transition-property: transform;

        -ms-transition-property: transform;

         -o-transition-property: transform;

            transition-property: transform;

    -webkit-transition-duration: 2s;

       -moz-transition-duration: 2s;

        -ms-transition-duration: 2s;

         -o-transition-duration: 2s;

            transition-duration: 2s;

}

里面的transition-property和transition-durantion删了，效果依旧正常，是不是多余了