css持续旋转

.fa-spin {      -webkit-animation: fa-spin 2s infinite linear;      animation: fa-spin 2s infinite linear;    }    .fa-pulse {      -webkit-animation: fa-spin 1s infinite steps(8);      animation: fa-spin 1s infinite steps(8);    }    @-webkit-keyframes fa-spin {      0% {        -webkit-transform: rotate(0deg);        transform: rotate(0deg);      }      100% {        -webkit-transform: rotate(359deg);        transform: rotate(359deg);      }    }    @keyframes fa-spin {      0% {        -webkit-transform: rotate(0deg);        transform: rotate(0deg);      }      100% {        -webkit-transform: rotate(359deg);        transform: rotate(359deg);      }    }