1.transform:2D 3D转换 (旋转(rotate)、缩放(scale)、移动(translate)、倾斜(skew))
2.transition:过渡(transition-property(名称)、 transition-duration(完成时间)、transition-timing-function(速度曲线)、transition-delay(何时开始))
-webkit-transform: rotate(-135deg);
-ms-transform: rotate(-135deg);
-o-transform: rotate(-135deg);
transform: rotate(-135deg);
-webkit-transition: all .3s ease, opacity 2s ease, top 1s ease;
-o-transition: all .3s ease, opacity 2s ease, top 1s ease;
transition: all .3s ease, opacity 2s ease, top 1s ease