一些常用动画

旋转动画——loading

@keyframes loadingRotate{
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}
.loading{
    animation: loadingRotate 1s linear infinite;
}

下拉效果

.slidedown{
    margin-top: {xx}px; 
    transition: margin-top 600ms ease;
}