.dropload-up, .dropload-down { position: relative; height: 0; overflow: hidden; font-size: 12px; /* 开启硬件加速 */ -webkit-transform: translateZ(0); transform: translateZ(0); }
.dropload-down { height: 50px; }
.dropload-refresh, .dropload-update, .dropload-load, .dropload-noData { height: 50px; line-height: 50px; text-align: center; }
.dropload-load .loading { display: inline-block; height: 15px; width: 15px; border-radius: 100%; margin: 6px; border: 2px solid #666; border-bottom-color: transparent; vertical-align: middle; -webkit-animation: rotate 0.75s linear infinite; animation: rotate 0.75s linear infinite; }

@-webkit-keyframes rotate {
    0% { -webkit-transform: rotate(0deg); }
    50% { -webkit-transform: rotate(180deg); }
    100% { -webkit-transform: rotate(360deg); }
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    50% { transform: rotate(180deg); }
    100% { transform: rotate(360deg); }
}