img{
　　animation:rotate 1s linear infinite;
　　-webkit-animation:rotate 1s linear infinite;
}

@keyframes rotate
{
from {transform:rotate(0) ;}
to {transform:rotate(360deg);}
}
@-webkit-keyframes rotate
{
from {transform:rotate(0) ;}
to {transform:rotate(360deg);}
}

png图片的loading旋转